Fix Windows compilation.

Don't take for granted that these are included...

Task-number: QTBUG-14614
Reviewed-by: Bradley T. Hughes

Author: Samuel Rødal

src/gui/painting/qpaintengine_raster.cpp

@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include <QtCore/qglobal.h>
+#include <QtCore/qmutex.h>
 
 #define QT_FT_BEGIN_HEADER
 #define QT_FT_END_HEADER

tests/auto/qpainter/tst_qpainter.cpp

@@ -49,6 +49,7 @@
 #include <qfontmetrics.h>
 #include <qbitmap.h>
 #include <qimage.h>
+#include <qthread.h>
 #include <limits.h>
 #if !defined(Q_OS_WINCE) && !defined(Q_OS_SYMBIAN)
 #include <qprinter.h>