Supress deprecation warning on XKeycodeToKeysym

src/mumble/GlobalShortcut_unix.cpp

@@ -352,7 +352,16 @@ QString GlobalShortcutX::buttonName(const QVariant &v) {
 	if (!ok)
 		return QString();
 	if ((key < 0x118) || (key >= 0x128)) {
+
+		// For backwards compatibility reasons we want to keep using the
+		// old function as long as possible. The replacement function
+		// XkbKeycodeToKeysym requires the XKB extension which isn't
+		// guaranteed to be present.
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
 		KeySym ks=XKeycodeToKeysym(display, static_cast<KeyCode>(key), 0);
+#pragma GCC diagnostic pop
+
 		if (ks == NoSymbol) {
 			return QLatin1String("0x")+QString::number(key,16);
 		} else {