libtriple: implement fast forward in cPlayback()

First try at implementing fast forward. Needs more love.
Reverse does not work yet, setting speed to negative values
right now simply resets to "play" mode.

libtriple/video_td.cpp

@@ -644,3 +644,9 @@ void cVideo::routeVideo(int standby)
 		perror("IOC_AVS_ROUTE_ENC2TV");
 	close(avsfd);
 }
+
+void cVideo::FastForwardMode(int mode)
+{
+	lt_debug("cVideo::%s\n", __FUNCTION__);
+	fop(ioctl, MPEG_VID_FASTFORWARD, mode);
+}