evil hack: map the buffer once and use this pointer after unmaping

This isn't allowed by gl and may _only_ work, if the driver uses cpu bound buffer.
But it may speed up :-)

Source/Plugins/Plugin_VideoOGL/Src/StreamBuffer.h

@@ -29,6 +29,7 @@ enum StreamType {
 	STREAM_DETECT,
 	MAP_AND_ORPHAN,
 	MAP_AND_SYNC,
+	MAP_AND_RISK,
 	PINNED_MEMORY,
 	BUFFERSUBDATA
 };