win32: coreutils/tr.c: use actail/isactype

tr implements its own char classes setup, using index_in_strings and
"precompiling" the various classes chars. We can replace the lot with
a single loop of actail/isactype, which saves about 500 bytes.

Additionally, for unclear reasons, it didn't support [:graph:] and
[:print:], maybe because isgraph and isprint are disabled in libbb.h
because they're locale-dependent.

The new implementation using ac* does add support for these, and so tr
on windows now supports e.g. 'tr [:print:] X' which it didn't before.

This is the first use of actail, and demonstrates the usecases for it
(win32/fnmatch.c could use it as well, but the current code is too
branched to use it while keeping identical behavior, and regcomp.c
extracts the name from [:NAME:] on its own).

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