configure: dismiss libutil.h
Recent versions of libc on Linux (Debian Testing) create lots of
compile warnings about direct usage of libutil.h
diff --git a/configure.ac b/configure.ac
index b3f42d5..6da71c2 100755
--- a/configure.ac
+++ b/configure.ac
@@ -395,7 +395,7 @@
dnl -------------------------
AC_CHECK_HEADERS([stropts.h sys/ksym.h sys/times.h sys/select.h \
sys/types.h linux/version.h netdb.h asm/types.h \
- sys/param.h limits.h signal.h libutil.h \
+ sys/param.h limits.h signal.h \
sys/socket.h netinet/in.h time.h sys/time.h])
dnl Utility macro to avoid retyping includes all the time