Fix windows build

Author: jcfain

src/lib/handler/settingshandler.cpp

@@ -478,14 +478,16 @@ void SettingsHandler::Load(QSettings* settingsToLoadFrom)
 #if defined(Q_OS_WIN)
         const char* backend = "windows";
         LogHandler::Info("Load Settings: OS is Windows");
+        putenv(const_cast<char *>("QT_MEDIA_BACKEND=windows"));
 #elif defined(Q_OS_LINUX)
         const char* backend = "gstreamer";
         LogHandler::Info("Load Settings: OS is Linux");
+        setenv("QT_MEDIA_BACKEND", backend, 1);
 #else // defined(Q_OS_MAC) MAC_OS, IOS or ANDROID
         LogHandler::Info("Load Settings: OS is Other");
         const char* backend = "darwin";
-#endif
         setenv("QT_MEDIA_BACKEND", backend, 1);
+#endif
         LogHandler::Info("Using media backend: "+QString(backend));
     }
 

src/lib/settings/medialibrarysettings.h

@@ -5,7 +5,9 @@
 #include "settingsbase.h"
 #include "../lookup/enum.h"
 
-class MediaLibrarySettings : public SettingsBase
+#include "XTEngine_global.h"
+
+class XTENGINE_EXPORT MediaLibrarySettings : public SettingsBase
 {
     Q_OBJECT
 public:

src/lib/settings/settingsbase.h

@@ -4,7 +4,9 @@
 #include <QObject>
 #include <QSettings>
 
-class SettingsBase : public QObject
+#include "XTEngine_global.h"
+
+class XTENGINE_EXPORT SettingsBase : public QObject
 {
     Q_OBJECT
 public: