Avoid spurious error when checking for linux/netlink.h
* configure.ac: Include <asm/types.h> when checking for
linux/netlink.h.
diff --git a/configure.ac b/configure.ac
index a935272..f16daa4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -263,7 +263,8 @@
], [], [])
AC_CHECK_HEADERS([linux/icmp.h linux/in6.h linux/netlink.h linux/if_packet.h],
[], [], [#include <stddef.h>
-#include <sys/socket.h>])
+#include <sys/socket.h>
+#include <asm/types.h>])
AC_CHECK_HEADERS([asm/sigcontext.h], [], [], [#include <signal.h>])
AC_CHECK_TYPES([struct sigcontext_struct,
struct sigcontext],,, [#include <signal.h>])