build(ci): bump zig to 0.15.1 and add more platforms

- Bump zig version to 0.15.1 and workaround zig fetch hang (ziglang/zig#24916)
- add mac os zig build (currently without luajit, linker failure)
- Add windows zig build, currently with very limited testing

test/functional/lua/option_and_var_spec.lua

@@ -463,9 +463,9 @@ describe('lua stdlib', function()
       eq(false, fn.luaeval "vim.v['false']")
       eq(NIL, fn.luaeval 'vim.v.null')
       matches([[attempt to index .* nil value]], pcall_err(exec_lua, 'return vim.v[0].progpath'))
-      eq('Key is read-only: count', pcall_err(exec_lua, [[vim.v.count = 42]]))
-      eq('Dict is locked', pcall_err(exec_lua, [[vim.v.nosuchvar = 42]]))
-      eq('Key is fixed: errmsg', pcall_err(exec_lua, [[vim.v.errmsg = nil]]))
+      matches('Key is read%-only: count$', pcall_err(exec_lua, [[vim.v.count = 42]]))
+      matches('Dict is locked$', pcall_err(exec_lua, [[vim.v.nosuchvar = 42]]))
+      matches('Key is fixed: errmsg$', pcall_err(exec_lua, [[vim.v.errmsg = nil]]))
       exec_lua([[vim.v.errmsg = 'set by Lua']])
       eq('set by Lua', eval('v:errmsg'))
       exec_lua([[vim.v.errmsg = 42]])
@@ -474,8 +474,8 @@ describe('lua stdlib', function()
       eq({ 'one', 'two' }, eval('v:oldfiles'))
       exec_lua([[vim.v.oldfiles = {}]])
       eq({}, eval('v:oldfiles'))
-      eq(
-        'Setting v:oldfiles to value with wrong type',
+      matches(
+        'Setting v:oldfiles to value with wrong type$',
         pcall_err(exec_lua, [[vim.v.oldfiles = 'a']])
       )
       eq({}, eval('v:oldfiles'))

test/functional/lua/xdiff_spec.lua

@@ -4,6 +4,7 @@ local n = require('test.functional.testnvim')()
 local clear = n.clear
 local exec_lua = n.exec_lua
 local eq = t.eq
+local matches = t.matches
 local pcall_err = t.pcall_err
 
 describe('xdiff bindings', function()
@@ -169,25 +170,25 @@ describe('xdiff bindings', function()
   end)
 
   it('can handle bad args', function()
-    eq([[Expected at least 2 arguments]], pcall_err(exec_lua, [[vim.text.diff('a')]]))
+    matches([[Expected at least 2 arguments$]], pcall_err(exec_lua, [[vim.text.diff('a')]]))
 
-    t.matches(
+    matches(
       [[bad argument %#1 to '_?diff' %(expected string%)]],
       pcall_err(exec_lua, [[vim.text.diff(1, 2)]])
     )
 
-    t.matches(
+    matches(
       [[bad argument %#3 to '_?diff' %(expected table%)]],
       pcall_err(exec_lua, [[vim.text.diff('a', 'b', true)]])
     )
 
-    eq(
-      [[invalid key: bad_key]],
+    matches(
+      [[invalid key: bad_key$]],
       pcall_err(exec_lua, [[vim.text.diff('a', 'b', { bad_key = true })]])
     )
 
-    eq(
-      [[on_hunk is not a function]],
+    matches(
+      [[on_hunk is not a function$]],
       pcall_err(exec_lua, [[vim.text.diff('a', 'b', { on_hunk = true })]])
     )
   end)