pkg: replace @cImport with addTranslateC in pkg/

@cImport is going to disappear in Zig 0.17. Its deprecated in Zig 0.16.
Let's remove it now.

Replace @cImport with addTranslateC across pkg/ packages. Each
package now has a c_import.h header that is translated at build
time via addTranslateC and exposed as a "cimport" module import.

Converted packages:
- dcimgui
- fontconfig
- freetype
- glslang
- harfbuzz
- macos
- oniguruma
- opengl
- sentry
- spirv-cross
- wuffs

Omitted:
- gtk4-layer-shell - This has a bit more complexity with how it
  interacts with GTK headers, so I need to consider this a bit more.
- src/ - It'll be cleaner to do this separately.

pkg/sentry/build.zig

@@ -46,6 +46,23 @@ pub fn build(b: *std.Build) !void {
 
     if (b.lazyDependency("sentry", .{})) |upstream| {
         module.addIncludePath(upstream.path("include"));
+
+        const tc = b.addTranslateC(.{
+            .root_source_file = b.path("c_import.h"),
+            .target = target,
+            .optimize = optimize,
+        });
+        if (target.result.os.tag.isDarwin()) {
+            const libc = try std.zig.LibCInstallation.findNative(.{
+                .allocator = b.allocator,
+                .target = &target.result,
+                .verbose = false,
+            });
+            tc.addSystemIncludePath(.{ .cwd_relative = libc.sys_include_dir.? });
+        }
+        tc.addIncludePath(upstream.path("include"));
+        module.addImport("c", tc.createModule());
+
         lib.addIncludePath(upstream.path("include"));
         lib.addIncludePath(upstream.path("src"));
         lib.addCSourceFiles(.{

pkg/sentry/c.zig

@@ -1,3 +0,0 @@
-pub const c = @cImport({
-    @cInclude("sentry.h");
-});

pkg/sentry/c_import.h

@@ -0,0 +1 @@
+#include "sentry.h"

pkg/sentry/envelope.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const assert = std.debug.assert;
-const c = @import("c.zig").c;
+const c = @import("c");
 const Value = @import("value.zig").Value;
 
 /// sentry_envelope_t

pkg/sentry/main.zig

@@ -1,4 +1,4 @@
-pub const c = @import("c.zig").c;
+pub const c = @import("c");
 
 const transport = @import("transport.zig");
 

pkg/sentry/transport.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const assert = std.debug.assert;
-const c = @import("c.zig").c;
+const c = @import("c");
 const Envelope = @import("envelope.zig").Envelope;
 
 /// sentry_transport_t

pkg/sentry/uuid.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const assert = std.debug.assert;
-const c = @import("c.zig").c;
+const c = @import("c");
 
 /// sentry_uuid_t
 pub const UUID = struct {

pkg/sentry/value.zig

@@ -1,6 +1,6 @@
 const std = @import("std");
 const assert = std.debug.assert;
-const c = @import("c.zig").c;
+const c = @import("c");
 const Level = @import("level.zig").Level;
 
 /// sentry_value_t