iproute2: Support IFF_LOWER_UP and IFF_DORMANT

In order to support these new flags add current
linux/if.h into the directory with the local copies.
This caused troubles with outdated redefinitions from net/if.h
so I've removed the dependency on it.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 98effa3..60a5a57 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -104,6 +104,8 @@
 	_PF(PORTSEL);
 	_PF(NOTRAILERS);
 	_PF(UP);
+	_PF(LOWER_UP);
+	_PF(DORMANT);
 #undef _PF
         if (flags)
 		fprintf(fp, "%x", flags);