Handle X11 events within the Win32 event loop

This unifies event handling and it allows X11 events to still be
processed even when the event loop is blocked.

src/wine-host/bridges/common.cpp

@@ -31,7 +31,7 @@ HostBridge::HostBridge(MainContext& main_context,
 
 HostBridge::~HostBridge() noexcept {}
 
-void HostBridge::handle_win32_events() noexcept {
+void HostBridge::handle_events() noexcept {
     MSG msg;
 
     for (int i = 0;