Fixed wierd windows unresolved external/__dllexport issue.
Fixed wierd windows unresolved external/__dllexport issue.

svn path=/trunk/libavg/; revision=3446

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