The PMIX_MODEX and PMIX_INFO_ARRAY macros were removed from the PMIx 3.1 standard.
Open MPI does not really need them (they are only used to be reported as not supported),
so smply #ifdef protect them to support an external PMIx v3.1
The change only need to be done in ext3x/ext3x.c.
But since this file is automatically generated from pmix3x/pmix3x.c, we have to update
the latter file.
Refs. open-mpi/ompi#6247
Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>
(back-ported from commit open-mpi/ompi@950ba16aa1)
61108b6228