Revert "zig build: wcslcpy/wcslcat are available on Linux"

This reverts commit b8ea316.

Turns out these require you to link libc, which we don't want to force
the user to do.

Author: castholm

Diff for: build.zig

@@ -93,8 +93,8 @@ pub fn build(b: *std.Build) void {
             .HAVE_MEMCMP = windows or linux or macos,
             .HAVE_WCSLEN = windows or linux or macos,
             .HAVE_WCSNLEN = windows or linux or macos,
-            .HAVE_WCSLCPY = linux or macos,
-            .HAVE_WCSLCAT = linux or macos,
+            .HAVE_WCSLCPY = macos,
+            .HAVE_WCSLCAT = macos,
             .HAVE_WCSSTR = windows or linux or macos,
             .HAVE_WCSCMP = windows or linux or macos,
             .HAVE_WCSNCMP = windows or linux or macos,