[OpenMPI] add a new port

[cenit]

No description provided.

[cenit]

i also provided a generic mpi port, which is the one that should be used. It redirects to msmpi on windows, openmpi otherwise.
Still untested, but it should be ready

[cenit]

there are failures on Windows but I think they are perfectly acceptable, since openmpi is ported only for linux/mac

[vicroms]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[vicroms]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[vicroms]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[vicroms]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[vicroms]

Sorry for the barrage of /azp run, this PR exposed some flaky ports that weren't fixed yet.

[cenit]

Sure! I have a special talent for exposing this kind of problems :D
Please let me know if I can help in any way

[vicroms]

Is there a reason why UWP support has been disabled?

There's a regression on msmpi:x64-uwp, and I'm also able to build it locally.

[cenit]

msmpi is not built from source (unfortunately - microsoft/Microsoft-MPI#2), so I just assumed the library was not uwp-ready (the same .lib is used for x64-windows...)
Unfortunately I don't have any program to test msmpi:x64-uwp, if you have any please let me know if I overlooked it. My principle was "better safe than sorry", and so I removed the compatibility if it was not really there.

[vicroms]

Thanks for the PR!