Support SO_SNDBUFFORCE/SO_RCVBUFFORCE by aliasing them to the

standard SO_SNDBUF/SO_RCVBUF.  Mostly cosmetics, to get rid
of the warning during 'apt upgrade'.

MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D25173

sys/compat/linux/linux_socket.c

@@ -212,8 +212,10 @@ linux_to_bsd_so_sockopt(int opt)
 	case LINUX_SO_BROADCAST:
 		return (SO_BROADCAST);
 	case LINUX_SO_SNDBUF:
+	case LINUX_SO_SNDBUFFORCE:
 		return (SO_SNDBUF);
 	case LINUX_SO_RCVBUF:
+	case LINUX_SO_RCVBUFFORCE:
 		return (SO_RCVBUF);
 	case LINUX_SO_KEEPALIVE:
 		return (SO_KEEPALIVE);

sys/compat/linux/linux_socket.h

@@ -200,6 +200,8 @@ int linux_accept(struct thread *td, struct linux_accept_args *args);
 #endif
 #define	LINUX_SO_TIMESTAMP	29
 #define	LINUX_SO_ACCEPTCONN	30
+#define	LINUX_SO_SNDBUFFORCE	32
+#define	LINUX_SO_RCVBUFFORCE	33
 
 /* Socket options */
 #define	LINUX_IP_TOS		1