Silence warnings on decltype() with Wine 5.22

There were already similar warnings on 32-bit winegcc, but now it also
happens on the 64-bit version. Instead of adding
`-Wno-ignored-attributes` we'll just sprinkle some warning ignores here
and there to prevent any other surprises.

meson.build

@@ -200,14 +200,7 @@ if with_bitbridge
       wine_threads_dep,
       xcb_dep
     ],
-    # FIXME: 32-bit winegcc defines `__stdcall` differently than the 64-bit
-    #        version, and one of the changes is the inclusion of
-    #        `__atribute__((__force_align_arg_pointer__))`. For whetever reason
-    #        this causes GCC to complain when using function pointers with the
-    #        `__stdcall` calling convention in template arguments, although it
-    #        otherwise works just fine. We don't ignore any warnings in the
-    #        regular host application so this should not cause any issues!
-    cpp_args : compiler_options + ['-m32', '-Wno-ignored-attributes'],
+    cpp_args : compiler_options + ['-m32'],
     link_args : ['-m32']
   )
 
@@ -225,7 +218,7 @@ if with_bitbridge
       wine_threads_dep,
       xcb_dep
     ],
-    cpp_args : compiler_options + ['-m32', '-Wno-ignored-attributes'],
+    cpp_args : compiler_options + ['-m32'],
     link_args : ['-m32']
   )
 endif

src/wine-host/bridges/vst2.h

@@ -153,6 +153,10 @@ class Vst2Bridge {
      */
     Configuration config;
 
+    // FIXME: This emits `-Wignored-attributes` as of Wine 5.22
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wignored-attributes"
+
     /**
      * The shared library handle of the VST plugin. I sadly could not get
      * Boost.DLL to work here, so we'll just load the VST plugisn by hand.
@@ -160,6 +164,8 @@ class Vst2Bridge {
     std::unique_ptr<std::remove_pointer_t<HMODULE>, decltype(&FreeLibrary)>
         plugin_handle;
 
+#pragma GCC diagnostic pop
+
     /**
      * The loaded plugin's `AEffect` struct, obtained using the above library
      * handle.

src/wine-host/editor.cpp

@@ -170,6 +170,9 @@ Editor::Editor(const Configuration& config,
 
     ShowWindow(win32_handle.get(), SW_SHOWNORMAL);
     if (config.editor_double_embed) {
+        // FIXME: This emits `-Wignored-attributes` as of Wine 5.22
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wignored-attributes"
         // As explained above, we can't do this directly in the initializer list
         win32_child_handle = std::unique_ptr<std::remove_pointer_t<HWND>,
                                              decltype(&DestroyWindow)>(
@@ -179,6 +182,7 @@ Editor::Editor(const Configuration& config,
                 client_area.width, client_area.height, win32_handle.get(),
                 nullptr, GetModuleHandle(nullptr), this),
             DestroyWindow);
+#pragma GCC diagnostic pop
 
         ShowWindow(win32_child_handle->get(), SW_SHOWNORMAL);
     }

src/wine-host/editor.h

@@ -197,6 +197,10 @@ class Editor {
      */
     const WindowClass window_class;
 
+    // FIXME: This emits `-Wignored-attributes` as of Wine 5.22
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wignored-attributes"
+
     /**
      * The handle for the window created through Wine that the plugin uses to
      * embed itself in.
@@ -216,6 +220,8 @@ class Editor {
         std::unique_ptr<std::remove_pointer_t<HWND>, decltype(&DestroyWindow)>>
         win32_child_handle;
 
+#pragma GCC diagnostic pop
+
     /**
      * The Win32 API will block the `DispatchMessage` call when opening e.g. a
      * dropdown, but it will still allow timers to be run so the GUI can still

src/wine-host/utils.h

@@ -181,12 +181,18 @@ class Win32Thread {
     Win32Thread& operator=(Win32Thread&&);
 
    private:
+    // FIXME: This emits `-Wignored-attributes` as of Wine 5.22
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wignored-attributes"
+
     /**
      * The handle for the thread that is running, will be a null pointer if this
      * class was constructed with the default constructor.
      */
     std::unique_ptr<std::remove_pointer_t<HANDLE>, decltype(&CloseHandle)>
         handle;
+
+#pragma GCC diagnostic pop
 };
 
 /**