Added windows version of getMemoryUsage().
Added windows version of getMemoryUsage().

svn path=/trunk/libavg/; revision=3817

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