WINCE: Fix missing cosf

cosf seems to be defined in the cmath header
for Windows CE, so include it to fix the
issue of not finding the symbol cosf.

Change-Id: I7317668838912325d45be0d4087ae3055940d3cd
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

src/gui/math3d/qmatrix4x4.cpp

@@ -45,6 +45,8 @@
 #include <QtGui/qmatrix.h>
 #include <QtGui/qtransform.h>
 
+#include <cmath>
+
 QT_BEGIN_NAMESPACE
 
 #ifndef QT_NO_MATRIX4X4

src/gui/math3d/qquaternion.cpp

@@ -45,6 +45,8 @@
 #include <QtCore/qvariant.h>
 #include <QtCore/qdebug.h>
 
+#include <cmath>
+
 QT_BEGIN_NAMESPACE
 
 #ifndef QT_NO_QUATERNION