added include for fife_stdint.h in gui_image.h to fix compile error using msvc 2008.
added include for fife_stdint.h in gui_image.h to fix compile error using msvc 2008.

cbeck88/fifengine,Niektory/fifengine,gravitystorm/fifengine,gravitystorm/fifengine,gravitystorm/fifengine,cbeck88/fifengine,fifengine/fifengine,cbeck88/fifengine,Niektory/fifengine,fifengine/fifengine,fifengine/fifengine,gravitystorm/fifengine,Niektory/fifengine,cbeck88/fifengine