iptables: unbreak build with ipv6 after r25897.

Make ipv6 support optional. Patch by Steffen Schulz <sf@cbg.dyndns.org>

Submitted upstream as http://bugzilla.netfilter.org/show_bug.cgi?id=588

diff -ru iptables-1.4.2/configure.ac iptables-1.4.2_patched/configure.ac

--- iptables-1.4.2/configure.ac	2009-03-29 15:49:24.764299587 +0000

+++ iptables-1.4.2_patched/configure.ac	2009-03-29 15:38:29.082512186 +0000

---

 Makefile.am  |   16 +++++++++++++---

 configure.ac |    4 ++++

 xtables.c    |    3 +++

 3 files changed, 20 insertions(+), 3 deletions(-)

Index: iptables-1.4.2/configure.ac

===================================================================

--- iptables-1.4.2.orig/configure.ac

+++ iptables-1.4.2/configure.ac

@@ -37,6 +37,9 @@

 	[enable_devel="$enableval"], [enable_devel="yes"])

 AC_ARG_ENABLE([libipq],

 regular_CFLAGS="-D_LARGEFILE_SOURCE=1 -D_LARGE_FILES -D_FILE_OFFSET_BITS=64 \

 	-D_REENTRANT -Wall -Waggregate-return -Wmissing-declarations \

Only in iptables-1.4.2: configure.ac.orig

Only in iptables-1.4.2: configure.ac.rej

diff -ru iptables-1.4.2/Makefile.am iptables-1.4.2_patched/Makefile.am

--- iptables-1.4.2/Makefile.am	2008-10-08 16:31:58.000000000 +0000

+++ iptables-1.4.2_patched/Makefile.am	2009-03-29 15:38:29.082512186 +0000

@@ -80,11 +80,17 @@

Index: iptables-1.4.2/Makefile.am

===================================================================

--- iptables-1.4.2.orig/Makefile.am

+++ iptables-1.4.2/Makefile.am

@@ -3,6 +3,10 @@

 AUTOMAKE_OPTIONS = foreign subdir-objects

 AM_CFLAGS        = ${regular_CFLAGS} -I${top_builddir}/include -I${top_srcdir}/include ${kinclude_CFLAGS}

+if ENABLE_IPV6

+AM_CFLAGS       += -DENABLE_IPV6=1

+endif

+

 SUBDIRS         := extensions

 if ENABLE_LIBIPQ

 SUBDIRS         += libipq

@@ -80,11 +84,17 @@

 endif

 if ENABLE_STATIC

 endif

 iptables.8: ${srcdir}/iptables.8.in extensions/matches4.man extensions/targets4.man

diff -ru iptables-1.4.2/xtables.c iptables-1.4.2_patched/xtables.c

--- iptables-1.4.2/xtables.c	2008-10-08 16:31:58.000000000 +0000

+++ iptables-1.4.2_patched/xtables.c	2009-03-29 15:38:29.082512186 +0000

Index: iptables-1.4.2/xtables.c

===================================================================

--- iptables-1.4.2.orig/xtables.c

+++ iptables-1.4.2/xtables.c

@@ -964,6 +964,8 @@

 	}

 }