qt: Pass through -F dependency compile args to moc

Needed on macOS, where moc would otherwise fail to compile plugin
headers.

mesonbuild/modules/qt.py

@@ -455,7 +455,7 @@ def _compile_moc_impl(self, state: ModuleState, kwargs: MocCompilerKwArgs) -> T.
         inc = state.get_include_args(include_dirs=kwargs['include_directories'])
         compile_args: T.List[str] = []
         for dep in kwargs['dependencies']:
-            compile_args.extend(a for a in dep.get_all_compile_args() if a.startswith(('-I', '-D')))
+            compile_args.extend(a for a in dep.get_all_compile_args() if a.startswith(('-I', '-F', '-D')))
             if isinstance(dep, InternalDependency):
                 for incl in dep.include_directories:
                     compile_args.extend(f'-I{i}' for i in incl.to_string_list(self.interpreter.source_root, self.interpreter.environment.build_dir))