removed os_support.h

Originally committed as revision 2230 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/img.c

@@ -16,9 +16,7 @@
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
-#include <unistd.h>
 #include "avformat.h"
-#include "os_support.h"
 
 /* XXX: this is a hack */
 int loop_input = 0;