Fix detectWin32ResourceIncludeDirs

These changes got lost in a rebase or something. This commit will be squashed.

Author: squeek502

src/Compilation.zig

@@ -5188,6 +5188,15 @@ fn failCObjWithOwnedErrorMsg(
 fn detectWin32ResourceIncludeDirs(arena: Allocator, options: InitOptions) !LibCDirs {
     // Set the includes to .none here when there are no rc files to compile
     var includes = if (options.rc_source_files.len > 0) options.rc_includes else .none;
+    if (builtin.target.os.tag != .windows) {
+        switch (includes) {
+            // MSVC can't be found when the host isn't Windows, so short-circuit.
+            .msvc => includes = .none,
+            // Skip straight to gnu since we won't be able to detect MSVC on non-Windows hosts.
+            .any => includes = .gnu,
+            .none, .gnu => {},
+        }
+    }
     while (true) {
         switch (includes) {
             .any, .msvc => return detectLibCIncludeDirs(
@@ -5212,21 +5221,12 @@ fn detectWin32ResourceIncludeDirs(arena: Allocator, options: InitOptions) !LibCD
                 }
                 return err;
             },
-            .gnu => return detectLibCIncludeDirs(
-                arena,
-                options.zig_lib_directory.path.?,
-                .{
-                    .cpu = options.target.cpu,
-                    .os = options.target.os,
-                    .abi = .gnu,
-                    .ofmt = options.target.ofmt,
-                },
-                options.is_native_abi,
-                // The .rc preprocessor will need to know the libc include dirs even if we
-                // are not linking libc, so force 'link_libc' to true
-                true,
-                options.libc_installation,
-            ),
+            .gnu => return detectLibCFromBuilding(arena, options.zig_lib_directory.path.?, .{
+                .cpu = options.target.cpu,
+                .os = options.target.os,
+                .abi = .gnu,
+                .ofmt = options.target.ofmt,
+            }),
             .none => return LibCDirs{
                 .libc_include_dir_list = &[0][]u8{},
                 .libc_installation = null,