seecomp : fix x86 __X32_SYSCALL_BIT

nfq/sec.c

@@ -13,6 +13,8 @@
 #include <sys/syscall.h>
 #include <linux/seccomp.h>
 #include <linux/filter.h>
+// __X32_SYSCALL_BIT defined in linux/unistd.h
+#include <linux/unistd.h>
 #include <syscall.h>
 #include <errno.h>