configure.ac: change readlink -f to -m

Change "readlink -f" to "readlink -m" since $libdir/$with_runtime_libdir
may not exist.

This patch should go to the upstream, I will send it sooner.

Upstream-Status: Pending

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
---
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
--- a/configure.ac
+++ b/configure.ac
@@ -271,7 +271,7 @@ AC_ARG_WITH(runtime-libdir,
            [],
 	   [with_runtime_libdir=""])
 GLIB_RUNTIME_LIBDIR="$with_runtime_libdir"
-ABS_GLIB_RUNTIME_LIBDIR="`readlink -f $libdir/$with_runtime_libdir`"
+ABS_GLIB_RUNTIME_LIBDIR="`readlink -m $libdir/$with_runtime_libdir`"
 AC_SUBST(GLIB_RUNTIME_LIBDIR)
 AC_SUBST(ABS_GLIB_RUNTIME_LIBDIR)
 AM_CONDITIONAL(HAVE_GLIB_RUNTIME_LIBDIR, [test "x$with_runtime_libdir" != "x"])
-- 
1.8.1.2