[Issue 24576] Now that OMF support has been dropped, the standard library should be called `phobos32` not `phobos32mscoff`

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24576

--- Comment #2 from Nicholas Wilson <iamthewilsonator at hotmail.com> ---
the different directory and the smattering of Makefiles changes, compiler
sc.ini, etc. was part of the reason that this was such a PITA to try to change
it. We should have it configured in one place  ideally.

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