replace libeditline with libedit

cf/test-package.m4

@@ -1,7 +1,7 @@
 dnl $Id$
 dnl
 dnl rk_TEST_PACKAGE(package,headers,libraries,extra libs,
-dnl			default locations, conditional, config-program)
+dnl			default locations, conditional, config-program, headers)
 
 AC_DEFUN([rk_TEST_PACKAGE],[
 AC_ARG_WITH($1,
@@ -91,6 +91,7 @@ if test "$with_$1" != no; then
 	if test "$[]$1_cflags" -a "$[]$1_libs"; then
 		CFLAGS="$[]$1_cflags $save_CFLAGS"
 		LIBS="$[]$1_libs $save_LIBS"
+		m4_ifval([$8],[AC_CHECK_HEADERS([[$8]])])
 		AC_LINK_IFELSE([AC_LANG_PROGRAM([[$2]],[[]])],[
 			INCLUDE_$1="$[]$1_cflags"
 			LIB_$1="$[]$1_libs"
@@ -101,6 +102,7 @@ if test "$with_$1" != no; then
 		ires= lres=
 		for i in $header_dirs; do
 			CFLAGS="-I$i $save_CFLAGS"
+			m4_ifval([$8],[AC_CHECK_HEADERS([[$8]])])
 			AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[$2]],[[]])],[ires=$i;break])
 		done
 		for i in $lib_dirs; do