configure.ac: do not check for linux/in6.h

The last user of <linux/in6.h> was removed by commit v4.9-252-gf362a33.

* configure.ac (AC_CHECK_HEADERS): Remove linux/in6.h.

diff --git a/configure.ac b/configure.ac
index 96302808e9f9a620f6786b428c909888e04ce839..dad6bb07da034b8ab8ef744625cbc4715069ec22 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -414,11 +414,6 @@ AC_CHECK_HEADERS([netinet/tcp.h netinet/udp.h],,, [#include <netinet/in.h>])
 
 AC_CHECK_HEADERS([linux/mqueue.h],,, [#include <linux/types.h>])
 
-AC_CHECK_HEADERS([linux/in6.h],,,
-[#include <stddef.h>
-#include <sys/socket.h>
-#include <asm/types.h>])
-
 AC_CHECK_HEADERS(m4_normalize([
        linux/netfilter_arp/arp_tables.h
        linux/netfilter_bridge/ebtables.h