Fix build config suffixes

[stratakis]

Build configs that inherit from the same configuration need a suffix in order
to not duplicate the build directory

[vstinner]

Thanks. I merged your PR.

[gpshead]

This PR caused a bunch of build slave's disks to fill up by abandoning their old build directories and creating new ones. https://bugs.python.org/issue38269

It also contains a typo in at least one of the names.

[vstinner]

This PR caused a bunch of build slave's disks to fill up by abandoning their old build directories and creating new ones.

Oh, I didn't expect this side effect. Should we contact buildbot owners to ask them to cleanup old directories?

It also contains a typo in at least one of the names.

Oh, ".clang-usban" should be ".clang-ubsan". Did you see other typos?

I wrote #112 to fix the typo. I understand that you will have to remove the old directory once this PR will be merged (and deployed)

[gpshead]

If we've got a mailing list of all bot owners maybe send a note "by the way, check for unused build directories and remove them" on your bots. Otherwise, it is probably easiest to just wait for other bots to fall over. My VMs have a "small" 10gig default vm disk size.

the buildbot project appears to already have an issue open asking for it to auto-delete. i nudged that.