Fixed rgba bitmap save blue/red flip.
Fixed rgba bitmap save blue/red flip.

svn path=/trunk/libavg/; revision=6638

hoodie/libavg,libavg/libavg,yyd01245/libavg,yyd01245/libavg,th3infinity/libavg,libavg/libavg,hoodie/libavg,scotty007/libavg,th3infinity/libavg,hoodie/libavg,th3infinity/libavg,libavg/libavg,yyd01245/libavg,scotty007/libavg,yyd01245/libavg,th3infinity/libavg,hoodie/libavg,scotty007/libavg,scotty007/libavg,libavg/libavg