configure: inlcude sys/types.h when checking sys/socket.h

Silly BSD systems need this despite POSIX requiring nothing of the
kind.  Any system with sys/socket.h should also have sys/types.h,
so this is unlikely to break anything, and we already do this in
another place.

Originally committed as revision 21326 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -2499,7 +2499,7 @@ texi2html -version > /dev/null 2>&1 && enable texi2html || disable texi2html
 if enabled network; then
     check_type "sys/types.h sys/socket.h" socklen_t
     check_type netdb.h "struct addrinfo"
-    check_type sys/socket.h "struct sockaddr_storage"
+    check_type "sys/types.h sys/socket.h" "struct sockaddr_storage"
     # Prefer arpa/inet.h over winsock2
     if check_header arpa/inet.h ; then
         check_func closesocket