Consolidate all the opal/orte/ompi .m4 files back to the top-level

config/ directory.  We split them apart a while ago in the hopes that
it would simplify things, but it didn't really (e.g., because there
were still some ompi/opal .m4 files in the top-level config/
directory, resulting in developer confusion where any given m4 macro
was defined).

So this commit consolidates them back into the top-level directory for
simplicity.  

There's still (at least) two changes that would be nice to make:

 1. Split any generated .m4 file (e.g., autogen-generated .m4 files)
    into a separate directory somewhere so that a top-level -Iconfig/
    will only get our explicitly defined macros, not the autogen stuff
    (e.g., with libevent2019 needing to get the visibility macro, but
    NOT all the autogen-generated inclusion of component configure.m4
    files).
 1. Change configure to be of the form:
{{{
# ...a small amount of preamble/setup...
OPAL_SETUP
m4_ifdef([project_orte], [ORTE_SETUP])
m4_ifdef([project_ompi], [OMPI_SETUP])
# ...a small amount of finishing stuff...
}}}

I doubt we'll ever get anything as clean as that, but that would be
the goal to shoot for.

This commit was SVN r27704.

autogen.pl

@@ -1220,9 +1220,6 @@ safe_system("autom4te --language=m4sh opal_get_version.m4sh -o opal_get_version.
 verbose "==> Running autoreconf\n";
 chdir("..");
 my $cmd = "autoreconf -ivf --warnings=all,no-obsolete,no-override -I config";
-foreach my $project (@{$projects}) {
-    $cmd .= " -I $project->{dir}/config";
-}
 safe_system($cmd);
 
 #---------------------------------------------------------------------------

opal/mca/event/libevent2019/Makefile.am

@@ -10,7 +10,7 @@
 # $HEADER$
 #
 
-EXTRA_DIST = .windows
+EXTRA_DIST = .windows opal_check_visibility.m4
 
 AM_CPPFLAGS = -I$(srcdir)/libevent -I$(srcdir)/libevent/include -I$(builddir)/libevent/include -I$(srcdir)/libevent/compat
 

opal/mca/event/libevent2019/libevent/autogen.sh

@@ -3,7 +3,7 @@
 # Open MPI change: add -I for our m4 directory so that we can
 # find OPAL_CHECK_VISIBILITY
 ###################################
-OMPI="-I ../../../../../opal/config"
+OMPI="-I .."
 if [ -x "`which autoreconf 2>/dev/null`" ] ; then
    ###################################
    # Open MPI change: add -I for our m4 directory

opal/mca/event/libevent2019/opal_check_visibility.m4

@@ -0,0 +1 @@
+../../../../config/opal_check_visibility.m4