remove unneeded include

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@13414 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/ffmenc.c

@@ -21,7 +21,6 @@
 
 #include "avformat.h"
 #include "ffm.h"
-#include <unistd.h>
 
 /* disable pts hack for testing */
 int ffm_nopts = 0;