LibC: Stub out wcstold

Author: https://github.com/timschumi
Commit: e82dc7c77a
Pull-request: https://github.com/SerenityOS/serenity/pull/10298
Reviewed-by: https://github.com/bgianfo ✅

Userland/Libraries/LibC/wchar.cpp

@@ -441,4 +441,10 @@ double wcstod(const wchar_t*, wchar_t**)
     dbgln("TODO: Implement wcstod()");
     TODO();
 }
+
+long double wcstold(const wchar_t*, wchar_t**)
+{
+    dbgln("TODO: Implement wcstold()");
+    TODO();
+}
 }