net/iputils: fix ipv6 compile errors (thanks florian)

git-svn-id: svn://svn.openwrt.org/openwrt/packages@22011 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/iputils/patches/002-fix-ipv6.patch

@@ -0,0 +1,23 @@
+--- a/Makefile
++++ b/Makefile
+@@ -18,7 +18,10 @@ CFLAGS=$(CCOPT) $(GLIBCFIX) $(DEFINES)
+ 
+ IPV4_TARGETS=tracepath ping clockdiff arping tftpd
+ IPV6_TARGETS=tracepath6 traceroute6 ping6
+-TARGETS=$(IPV4_TARGETS) $(IPV6_TARGETS)
++TARGETS=$(IPV4_TARGETS)
++ifeq ($(CONFIG_IPV6),y)
++	TARGETS=$(IPV4_TARGETS) $(IPV6_TARGETS)
++endif
+ 
+ LASTTAG:=`git-describe HEAD | sed -e 's/-.*//'`
+ TAG:=`date +s%Y%m%d`
+@@ -29,7 +32,7 @@ all: $(TARGETS)
+ tftpd: tftpd.o tftpsubs.o
+ ping: ping.o ping_common.o
+ ping6: ping6.o ping_common.o
+-ping.o ping6.o ping_common.o: ping_common.h
++ping.o ping_common.o: ping_common.h
+ tftpd.o tftpsubs.o: tftp.h
+ 
+ rdisc_srv: rdisc_srv.o