Fixed python 2.7 compatibility issue in RoundedRect.
Fixed python 2.7 compatibility issue in RoundedRect.

svn path=/trunk/libavg/; revision=6664

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