Adjust a few old checks to use __FreeBSD_version macro to

determine which version of FreeBSD kernel we're compiling.

Approved by:	kib (mentor)

sys/contrib/ipfilter/netinet/ip_compat.h

@@ -985,10 +985,10 @@ typedef	u_int32_t	u_32_t;
 typedef struct mbuf mb_t;
 # endif /* _KERNEL */
 
-# if __FreeBSD__ < 3
+# if __FreeBSD_version < 300000
 #  include <machine/spl.h>
 # else
-#  if __FreeBSD__ == 3
+#  if __FreeBSD_version < 400000
 #   if defined(IPFILTER_LKM) && !defined(ACTUALLY_LKM_NOT_KERNEL)
 #    define	ACTUALLY_LKM_NOT_KERNEL
 #   endif

sys/contrib/ipfilter/netinet/ip_proxy.c

@@ -63,7 +63,7 @@ struct file;
 # include <sys/stream.h>
 # include <sys/kmem.h>
 #endif
-#if __FreeBSD__ > 2
+#if __FreeBSD_version >= 300000
 # include <sys/queue.h>
 #endif
 #include <net/if.h>