o net/ipv4/raw.c: add missing include <linux/mroute.h>

Also add a include <net/sock.h> to linux/mroute.h as it uses
struct sock, etc.

include/linux/mroute.h

@@ -126,6 +126,8 @@ struct igmpmsg
  */
 
 #ifdef __KERNEL__
+#include <net/sock.h>
+
 extern int ip_mroute_setsockopt(struct sock *, int, char *, int);
 extern int ip_mroute_getsockopt(struct sock *, int, char *, int *);
 extern int ipmr_ioctl(struct sock *sk, int cmd, unsigned long arg);

net/ipv4/raw.c

@@ -55,6 +55,7 @@
 #include <linux/sockios.h>
 #include <linux/socket.h>
 #include <linux/in.h>
+#include <linux/mroute.h>
 #include <linux/netdevice.h>
 #include <linux/in_route.h>
 #include <linux/route.h>