Enabled more warnings for gcc compiles.
Enabled more warnings for gcc compiles.

svn path=/trunk/libavg/; revision=6919

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