Fixes trac:2611: get updated code from GASNet (thanks Paul Hargrove!) that

handles more modern versions of Autoconf's --program-transform
arguments.  Also make it clear that the message is coming from Open
MPI logic, so that we don't blame Autoconf, Red Hat, or anyone else
next time!

This commit was SVN r24024.

The following Trac tickets were found above:
  Ticket 2611 --> https://svn.open-mpi.org/trac/ompi/ticket/2611

opal/config/opal_functions.m4

@@ -179,13 +179,13 @@ if test -z "$program_suffix" ; then
     program_suffix=NONE
 fi
 # undo transforms caused by empty prefix/suffix
-if test "$program_transform_name" = 's,^,,' || \
+if expr "$program_transform_name" : 's.^..$' >/dev/null || \
-   test "$program_transform_name" = 's,$$,,' || \
+   expr "$program_transform_name" : 's.$$..$' >/dev/null || \
-   test "$program_transform_name" = 's,$$,,;s,^,,' ; then
+   expr "$program_transform_name" : 's.$$..;s.^..$' >/dev/null ; then
     program_transform_name="s,x,x,"
 fi
 if test "$program_prefix$program_suffix$program_transform_name" != "NONENONEs,x,x," ; then
-    AC_MSG_WARN([*** This configure script does not support --program-prefix, --program-suffix or --program-transform-name. Users are recommended to instead use --prefix with a unique directory and make symbolic links as desired for renaming.])
+    AC_MSG_WARN([*** The Open MPI configure script does not support --program-prefix, --program-suffix or --program-transform-name. Users are recommended to instead use --prefix with a unique directory and make symbolic links as desired for renaming.])
     AC_MSG_ERROR([*** Cannot continue])
 fi