FreeBSD fix

Originally committed as revision 14699 to svn://svn.mplayerhq.hu/mplayer/trunk/postproc

postproc/swscale.c

@@ -53,6 +53,7 @@ untested special converters
 #include <string.h>
 #include <math.h>
 #include <stdio.h>
+#include <unistd.h>
 #include "../config.h"
 #include "../mangle.h"
 #include <assert.h>