Fix an endianess issue with 32 bit pixmaps on big endian systems.
Fix an endianess issue with 32 bit pixmaps on big endian systems.

On big endian systems with Xrender, the QPixmap::toImage() function
did an unnecessary byte swap for 32 bit pixmaps.

Task-number: 196152
Reviewed-by: Samuel

igor-sfdc/qt-wk,KDE/qt,RLovelett/qt,KDE/qt,igor-sfdc/qt-wk,radekp/qt,KDE/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,RLovelett/qt,radekp/qt,KDE/qt,RLovelett/qt,RLovelett/qt,radekp/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,radekp/qt,KDE/qt,RLovelett/qt,RLovelett/qt,KDE/qt,radekp/qt,radekp/qt,RLovelett/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,RLovelett/qt,radekp/qt,pruiz/wkhtmltopdf-qt,KDE/qt,pruiz/wkhtmltopdf-qt,radekp/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,radekp/qt,KDE/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt