Make sure we don't leak os.args. Fixes #1633.

os.args is never freed, while this is an insignificant leak, it is a bit
annoying as it makes valgrind complain:

==234270== Memcheck, a memory error detector
==234270== Copyright (C) 2002-2024, and GNU GPL'd, by Julian Seward et al.
==234270== Using Valgrind-3.24.0 and LibVEX; rerun with -h for copyright info
==234270== Command: ./wc /tmp/mulumulu
==234270==
       1       8      58 /tmp/mulumulu
==234270==
==234270== HEAP SUMMARY:
==234270==     in use at exit: 47 bytes in 1 blocks
==234270==   total heap usage: 5 allocs, 4 frees, 4,195,875 bytes allocated
==234270==
==234270== 47 bytes in 1 blocks are possibly lost in loss record 1 of 1
==234270==    at 0x484BC13: calloc (vg_replace_malloc.c:1675)
==234270==    by 0x402E49: runtime._heap_alloc-769 (in /d/learn-odin/wc/wc)
==234270==    by 0x40A8D7: runtime.heap_alloc (in /d/learn-odin/wc/wc)
==234270==    by 0x436E9D: runtime.heap_allocator_proc.aligned_alloc-0 (in /d/learn-odin/wc/wc)
==234270==    by 0x4022DC: runtime.heap_allocator_proc (in /d/learn-odin/wc/wc)
==234270==    by 0x4165E0: runtime.make_aligned-22560 (in /d/learn-odin/wc/wc)
==234270==    by 0x41F6D0: runtime.make_slice-22340 (in /d/learn-odin/wc/wc)
==234270==    by 0x40156B: os._alloc_command_line_arguments-4679 (in /d/learn-odin/wc/wc)
==234270==    by 0x4011AF: __$startup_runtime (in /d/learn-odin/wc/wc)
==234270==    by 0x406F17: main (in /d/learn-odin/wc/wc)
==234270==
==234270== LEAK SUMMARY:
==234270==    definitely lost: 0 bytes in 0 blocks
==234270==    indirectly lost: 0 bytes in 0 blocks
==234270==      possibly lost: 47 bytes in 1 blocks
==234270==    still reachable: 0 bytes in 0 blocks
==234270==         suppressed: 0 bytes in 0 blocks
==234270==
==234270== For lists of detected and suppressed errors, rerun with: -s
==234270== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)

With the fix the leak is gone, tested on linux only.

While here, also make _alloc_command_line_arguments() private.

core/os/os_darwin.odin

@@ -1196,7 +1196,7 @@ _processor_core_count :: proc() -> int {
 	return 1
 }
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	res := make([]string, len(runtime.args__))
 	for _, i in res {
@@ -1205,6 +1205,11 @@ _alloc_command_line_arguments :: proc() -> []string {
 	return res
 }
 
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}
+
 socket :: proc(domain: int, type: int, protocol: int) -> (Socket, Error) {
 	result := _unix_socket(c.int(domain), c.int(type), c.int(protocol))
 	if result < 0 {

core/os/os_freebsd.odin

@@ -936,7 +936,7 @@ _processor_core_count :: proc() -> int {
 }
 
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	res := make([]string, len(runtime.args__))
 	for arg, i in runtime.args__ {
@@ -944,3 +944,8 @@ _alloc_command_line_arguments :: proc() -> []string {
 	}
 	return res
 }
+
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}

core/os/os_haiku.odin

@@ -316,7 +316,7 @@ file_size :: proc(fd: Handle) -> (i64, Error) {
 // "Argv" arguments converted to Odin strings
 args := _alloc_command_line_arguments()
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	res := make([]string, len(runtime.args__))
 	for arg, i in runtime.args__ {
@@ -325,6 +325,11 @@ _alloc_command_line_arguments :: proc() -> []string {
 	return res
 }
 
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}
+
 @(private, require_results)
 _stat :: proc(path: string) -> (OS_Stat, Error) {
 	runtime.DEFAULT_TEMP_ALLOCATOR_TEMP_GUARD()

core/os/os_linux.odin

@@ -1069,7 +1069,7 @@ _processor_core_count :: proc() -> int {
 	return int(_unix_get_nprocs())
 }
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	res := make([]string, len(runtime.args__))
 	for arg, i in runtime.args__ {
@@ -1078,6 +1078,11 @@ _alloc_command_line_arguments :: proc() -> []string {
 	return res
 }
 
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}
+
 @(require_results)
 socket :: proc(domain: int, type: int, protocol: int) -> (Socket, Error) {
 	result := unix.sys_socket(domain, type, protocol)

core/os/os_netbsd.odin

@@ -986,7 +986,7 @@ _processor_core_count :: proc() -> int {
 	return 1
 }
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	res := make([]string, len(runtime.args__))
 	for arg, i in runtime.args__ {
@@ -994,3 +994,8 @@ _alloc_command_line_arguments :: proc() -> []string {
 	}
 	return res
 }
+
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}

core/os/os_openbsd.odin

@@ -885,7 +885,7 @@ _processor_core_count :: proc() -> int {
 	return int(_sysconf(_SC_NPROCESSORS_ONLN))
 }
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	res := make([]string, len(runtime.args__))
 	for arg, i in runtime.args__ {
@@ -893,3 +893,8 @@ _alloc_command_line_arguments :: proc() -> []string {
 	}
 	return res
 }
+
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}

core/os/os_wasi.odin

@@ -27,7 +27,7 @@ stderr: Handle = 2
 
 args := _alloc_command_line_arguments()
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> (args: []string) {
 	args = make([]string, len(runtime.args__))
 	for &arg, i in args {
@@ -36,6 +36,11 @@ _alloc_command_line_arguments :: proc() -> (args: []string) {
 	return
 }
 
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	delete(args)
+}
+
 // WASI works with "preopened" directories, the environment retrieves directories
 // (for example with `wasmtime --dir=. module.wasm`) and those given directories
 // are the only ones accessible by the application.

core/os/os_windows.odin

@@ -193,7 +193,7 @@ current_thread_id :: proc "contextless" () -> int {
 
 
 
-@(require_results)
+@(private, require_results)
 _alloc_command_line_arguments :: proc() -> []string {
 	arg_count: i32
 	arg_list_ptr := win32.CommandLineToArgvW(win32.GetCommandLineW(), &arg_count)
@@ -215,6 +215,14 @@ _alloc_command_line_arguments :: proc() -> []string {
 	return arg_list
 }
 
+@(private, fini)
+_delete_command_line_arguments :: proc() {
+	for s in args {
+		delete(s)
+	}
+	delete(args)
+}
+
 /*
 	Windows 11 (preview) has the same major and minor version numbers
 	as Windows 10: 10 and 0 respectively.