configure: be more verbose about fort TS 29113

[hppritcha]

It turns out that those working with the fortran bindings are becoming increasingly aware of the need to know whether or not Open MPI fortran bindings are being built by a fortran compiler that is 2018 compliant or at least supports 2008 plus TS 29113.

with this patch, when using a fortran compiler that supports TS 29113 features the configury summary will be:

Open MPI configuration:

Version: 5.1.0a1
MPI Standard Version: 3.1
Build MPI C bindings: yes
Build MPI Fortran bindings: mpif.h, use mpi, use mpi_f08(TS 29113)
Build MPI Java bindings (experimental): no
Build Open SHMEM support: false (no spml)
Debug build: no
Platform file: (none)

If the compiler doesn't support TS 29113 features then the (TS 29113) will not be present.

[jsquyres]

Suggested change

	echo "Build MPI Fortran bindings: mpif.h, use mpi, use mpi_f08(TS 29113)" >&AS_MESSAGE_FD
	echo "Build MPI Fortran bindings: mpif.h, use mpi, use mpi_f08 (including TS 29113 support)" >&AS_MESSAGE_FD

[jsquyres]

Suggested change

	echo "Build MPI Fortran bindings: mpif.h, use mpi, use mpi_f08" >&AS_MESSAGE_FD
	echo "Build MPI Fortran bindings: mpif.h, use mpi, use mpi_f08 (NOT including TS 29113 support)" >&AS_MESSAGE_FD

[jsquyres]

Do we need a corresponding change in ompi_info output?

[hppritcha]

oh good point about ompi_info. I will add a similar change there.

[hppritcha]

Hmm. well actually ompi_info has a fairly complete area for verbiage about fortran support although i'm sceptical about what its saying about the Intel One API fortran compiler:

Fort mpi_f08 compliance: The mpi_f08 module is available, but due to limitations in the ifx compiler and/or Open MPI, does not support the following: array subsections, direct passthru (where possible) to underlying Open MPI's C functionality

I need to investigate this subarray test in the configury.
Given the amount of verbiage already in the ompi_info output i'm not sure it needs to be supplemented with anything here. The TS 23119 support is implicit in the logic checks starting around https://github.com/open-mpi/ompi/blob/main/ompi/tools/ompi_info/param.c#L175

[hppritcha]

i think the part of ompi_info having to do with some of the mpi_f08 features is stale. and the declaration of MPI_SUBARRAYS_SUPPORTED is hardwired to false in mpif-config.h.in. I think changes to make ompi_info accurate will take more work. I'd rather do that in a subsequent PR. So even when the configury code in ompi_setup_mpi_fortran.m4 finds that OMPI_MPI_SUBARRAYS_SUPPORTED can be set to true, its currently being ignored.