Fixed gamma reset in tests for non-windows machines.
Fixed gamma reset in tests for non-windows machines.

svn path=/trunk/libavg/; revision=4119

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