netfilter: xt_SYNPROXY: include missing <linux/types.h>

./usr/include/linux/netfilter/xt_SYNPROXY.h:11: found __[us]{8,16,32,64} type without #include <linux/types.h>
Reported-by: Nkbuild test robot <lkp@intel.com>
Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org>

include/uapi/linux/netfilter/xt_SYNPROXY.h

 #ifndef _XT_SYNPROXY_H
 #define _XT_SYNPROXY_H
 
+#include <linux/types.h>
+
 #define XT_SYNPROXY_OPT_MSS		0x01
 #define XT_SYNPROXY_OPT_WSCALE		0x02
 #define XT_SYNPROXY_OPT_SACK_PERM	0x04