Remove stray <QtNetwork> includes

Module includes slow down the build when PCH is disabled, so don't use
them.

Change-Id: Ic0bf0d938ef06dea9dba6897df592311230a6529
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/gsttools/qgstappsrc.cpp

@@ -34,7 +34,6 @@
 #include <QDebug>
 
 #include "qgstappsrc_p.h"
-#include <QtNetwork>
 
 QGstAppSrc::QGstAppSrc(QObject *parent)
     :QObject(parent)

src/multimedia/audio/qsamplecache_p.cpp

@@ -33,8 +33,12 @@
 
 #include "qsamplecache_p.h"
 #include "qwavedecoder_p.h"
-#include <QtNetwork>
 
+#include <QtNetwork/QNetworkAccessManager>
+#include <QtNetwork/QNetworkReply>
+#include <QtNetwork/QNetworkRequest>
+
+#include <QtCore/QDebug>
 //#define QT_SAMPLECACHE_DEBUG
 
 QT_BEGIN_NAMESPACE

src/multimedia/audio/qsoundeffect_pulse_p.cpp

@@ -44,8 +44,8 @@
 
 #include <QtCore/qcoreapplication.h>
 #include <qaudioformat.h>
-#include <QtNetwork>
 #include <QTime>
+#include <QTimer>
 
 #include "qsoundeffect_pulse_p.h"
 

src/multimedia/playback/playlistfileparser.cpp

@@ -33,7 +33,9 @@
 
 #include "playlistfileparser_p.h"
 #include <qfileinfo.h>
+#include <QtCore/QDebug>
 #include <QtNetwork/QNetworkReply>
+#include <QtNetwork/QNetworkRequest>
 #include "qmediaobject_p.h"
 #include "qmediametadata.h"
 

src/multimedia/playback/playlistfileparser_p.h

@@ -45,8 +45,8 @@
 // We mean it.
 //
 
-#include <QtNetwork>
 #include "qtmultimediadefs.h"
+#include <QtNetwork/QNetworkRequest>
 
 QT_BEGIN_NAMESPACE