Changed GPU blur filters to use RGBA float textures instead of I float to work around Mac OpenGL bug.
Changed GPU blur filters to use RGBA float textures instead of I float to work around Mac OpenGL bug.

svn path=/trunk/libavg/; revision=5006

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