With Open MPI 5.0, the decision was made to stop building 3rd-party
packages, such as Libevent, HWLOC, PMIx, and PRRTE as MCA components
and instead 1) start relying on external libraries whenever possible
and 2) Open MPI builds the 3rd party libraries (if needed) as
independent libraries, rather than linked into libopen-pal.
This patch is the first step in that process, providing foundational
changes required for supporting 3rd-party packages, such as changes
to autogen.pl, the top-level Makefile.am, and introducing two
Autoconf macros to support running sub-configure scripts; one
supporting source in tarball form and the other supporting
source in a sub-tree.
Signed-off-by: Brian Barrett <bbarrett@amazon.com>
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