Better handling of the multimedia module

src/interface.cpp

@@ -22,7 +22,7 @@
 #include <QElapsedTimer>
 #include <QKeyEvent>
 
-#if QT_VERSION_MAJOR == 5
+#ifdef HAS_MULTIMEDIA
 #define BAD_APPLE_AUDIO
 #endif
 

src/src.pro

 QT       += core gui
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
-equals(QT_MAJOR_VERSION, 5): QT += multimedia
+qtHaveModule(multimedia)
+{
+DEFINES += HAS_MULTIMEDIA
+QT += multimedia
+}
 
 CONFIG += c++14
 TEMPLATE = app