strcasecmp() requires #include <strings.h>

Originally committed as revision 14728 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavdevice/v4l.c

@@ -30,6 +30,7 @@
 #define _LINUX_TIME_H 1
 #include <linux/videodev.h>
 #include <time.h>
+#include <strings.h>
 
 typedef struct {
     int fd;