kernel: add missed FEATUREs compat_freebsd 8-14

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week

sys/kern/kern_mib.c

@@ -630,6 +630,34 @@ FEATURE(compat_freebsd6, "Compatible with FreeBSD 6");
 FEATURE(compat_freebsd7, "Compatible with FreeBSD 7");
 #endif
 
+#ifdef COMPAT_FREEBSD8
+FEATURE(compat_freebsd8, "Compatible with FreeBSD 8");
+#endif
+
+#ifdef COMPAT_FREEBSD9
+FEATURE(compat_freebsd9, "Compatible with FreeBSD 9");
+#endif
+
+#ifdef COMPAT_FREEBSD10
+FEATURE(compat_freebsd10, "Compatible with FreeBSD 10");
+#endif
+
+#ifdef COMPAT_FREEBSD11
+FEATURE(compat_freebsd11, "Compatible with FreeBSD 11");
+#endif
+
+#ifdef COMPAT_FREEBSD12
+FEATURE(compat_freebsd12, "Compatible with FreeBSD 12");
+#endif
+
+#ifdef COMPAT_FREEBSD13
+FEATURE(compat_freebsd13, "Compatible with FreeBSD 13");
+#endif
+
+#ifdef COMPAT_FREEBSD14
+FEATURE(compat_freebsd14, "Compatible with FreeBSD 14");
+#endif
+
 /*
  * This is really cheating.  These actually live in the libc, something
  * which I'm not quite sure is a good idea anyway, but in order for