Rollup merge of #69937 - TyPR124:osstr_ascii, r=dtolnay

ASCII methods on OsStr

Would close #69566

I don't know enough about encodings to know if this is a valid change, however the comment on the issue suggests it could be.

This does two things:

1. Makes ASCII methods available on OsStr

2. Makes it possible to obtain a `&mut OsStr`. This is necessary to actually use `OsStr::make_ascii_*case` methods since they modify the underlying value. As far as I can tell, the only way to modify a `&mut OsStr` is via the methods I just added.

My original hope was to have these methods on `OsStrExt` for Windows, since the standard library already assumes `make_ascii_uppercase` is valid in Windows (see the change I made to windows/process.rs). If it is found these are not valid changes on non-Windows platforms, I can move the methods to the ext trait instead.

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