Don't build rank_file if you can't use it anyway

This commit was SVN r28233.

orte/mca/rmaps/rank_file/configure.m4

@@ -0,0 +1,19 @@
+# -*- shell-script -*-
+#
+# Copyright (c) 2013      Los Alamos National Security, LLC.
+#                         All rights reserved.
+# $COPYRIGHT$
+# 
+# Additional copyrights may follow
+# 
+# $HEADER$
+#
+# MCA_rmaps_rank_file_CONFIG([action-if-found], [action-if-not-found])
+# -----------------------------------------------------------
+AC_DEFUN([MCA_orte_rmaps_rank_file_CONFIG], [
+    AC_CONFIG_FILES([orte/mca/rmaps/rank_file/Makefile])
+
+    AS_IF([test "$OPAL_HAVE_HWLOC" = 1],
+          [$1],
+          [$2])
+])