Error when -rcincludes=msvc and MSVC can't be detected on the host

Author: squeek502

src/Compilation.zig

@@ -5191,7 +5191,7 @@ fn detectWin32ResourceIncludeDirs(arena: Allocator, options: InitOptions) !LibCD
     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,
+            .msvc => return error.WindowsSdkNotFound,
             // Skip straight to gnu since we won't be able to detect MSVC on non-Windows hosts.
             .any => includes = .gnu,
             .none, .gnu => {},