Added AVG_BREAK_ON_ASSERT support: If this env var is set, a failed AVG_ASSERT triggers a debug breakpoint.
Added AVG_BREAK_ON_ASSERT support: If this env var is set, a failed AVG_ASSERT triggers a debug breakpoint.

svn path=/trunk/libavg/; revision=4869

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