Decouple qmediametadata.h from qmultimedia.h

qmultimedia.h is included in more places, but qmediametadata.h is
larger. This patch should reduce unnecessary #include-ing.

Change-Id: I4a3d174bafc555d794bb75087c1f6b79745ae903
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/plugins/gstreamer/camerabin/camerabinimagecapture.cpp

@@ -46,6 +46,7 @@
 #include <private/qgstvideobuffer_p.h>
 #include <private/qvideosurfacegstsink_p.h>
 #include <private/qgstutils_p.h>
+#include <QtMultimedia/qmediametadata.h>
 #include <QtCore/qdebug.h>
 #include <QtCore/qbuffer.h>
 #include <QtGui/qimagereader.h>

src/plugins/gstreamer/camerabin/camerabinmetadata.cpp

@@ -41,6 +41,8 @@
 
 #include "camerabinmetadata.h"
 
+#include <QtMultimedia/qmediametadata.h>
+
 #include <gst/gst.h>
 #include <gst/gstversion.h>
 

src/plugins/gstreamer/mediacapture/qgstreamercapturemetadatacontrol.cpp

@@ -41,6 +41,8 @@
 
 #include "qgstreamercapturemetadatacontrol.h"
 
+#include <QtMultimedia/qmediametadata.h>
+
 #include <gst/gst.h>
 #include <gst/gstversion.h>
 

src/plugins/gstreamer/mediaplayer/qgstreamermetadataprovider.cpp

@@ -42,6 +42,7 @@
 #include "qgstreamermetadataprovider.h"
 #include "qgstreamerplayersession.h"
 #include <QDebug>
+#include <QtMultimedia/qmediametadata.h>
 
 #include <gst/gstversion.h>
 

src/plugins/gstreamer/mediaplayer/qgstreamerplayersession.cpp

@@ -52,6 +52,7 @@
 #include <gst/gstvalue.h>
 #include <gst/base/gstbasesrc.h>
 
+#include <QtMultimedia/qmediametadata.h>
 #include <QtCore/qdatetime.h>
 #include <QtCore/qdebug.h>
 #include <QtCore/qsize.h>