[NET]: fix PROC_FS=n compile

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sock.h

@@ -1377,9 +1377,7 @@ extern struct ctl_table core_table[];
 extern int sysctl_optmem_max;
 #endif
 
-#ifdef CONFIG_PROC_FS
 extern __u32 sysctl_wmem_default;
 extern __u32 sysctl_rmem_default;
-#endif
 
 #endif	/* _SOCK_H */