Add sys/time.h header #include, fixes compilation on OS/2.

patch by Dave Yeo, daveryeo telus net


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16077 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavformat/udp.c

@@ -32,6 +32,7 @@
 #ifdef HAVE_SYS_SELECT_H
 #include <sys/select.h>
 #endif
+#include <sys/time.h>
 
 #ifndef IPV6_ADD_MEMBERSHIP
 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP