build: remove INRIA, NRL and MUSICA IPv6 quirks

Valar dohaeris.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Acked-by: Greg Troxel <gdt@ir.bbn.com>
Acked-by: Feng Lu <lu.feng@6wind.com>
Acked-by: Paul Jakma <paul@jakma.org>
diff --git a/zebra/ipforward_sysctl.c b/zebra/ipforward_sysctl.c
index 8824418..57ed185 100644
--- a/zebra/ipforward_sysctl.c
+++ b/zebra/ipforward_sysctl.c
@@ -23,10 +23,6 @@
 #include "privs.h"
 #include "zebra/ipforward.h"
 
-#ifdef NRL
-#include <netinet6/in6.h>
-#endif /* NRL */
-
 #include "log.h"
 
 #define MIB_SIZ 4
@@ -106,7 +102,7 @@
 {
   CTL_NET,
   PF_INET6,
-#if defined(KAME) || defined(NRL)
+#if defined(KAME)
   IPPROTO_IPV6,
   IPV6CTL_FORWARDING
 #else /* NOT KAME */