putty: add main putty executable

[cho-m]

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We've gotten some requests for main executable. Currently, putty only installs companion utilities.

Otherwise, should probably rename formula as putty doesn't install PuTTY.

[cho-m]

Probably want to figure out how to handle conflict with open-mpi before merge (bin/pterm)

Most Linux distros rename/move binary on open-mpi/prrte side though there isn't a consistent name, e.g.

• Arch Linux - prrte-pterm¹
• Debian - pterm.openmpi²
• Fedora - lib64/openmpi/bin/pterm³

Footnotes

1. https://gitlab.archlinux.org/archlinux/packaging/packages/prrte/-/blob/main/PKGBUILD?ref_type=heads#L98 ↩

2. https://salsa.debian.org/hpc-team/openmpi/-/commit/bc77bea52370b3ac4a786402016fbff6113ea978 ↩

3. https://src.fedoraproject.org/rpms/prrte/blob/rawhide/f/prrte.spec#_106 ↩