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iswcntrl() regression


POSIX [1] requires that iswcntrl (EOF) == 0.

This was true in         CYGWIN_NT-10.0 2.9.0(0.318/5/3) (x86_64)
but is no longer true in CYGWIN_NT-10.0 2.11.1(0.329/5/3) (x86_64).
(Reported by Assaf Gordon.)

Looking at the changes that occurred in the cygwin git between
2.9.0 (on 2017-08-03) and 2.11.1 (on 2018-08-31)
it appears to me that the culprit is the commit
41f72ab4d7c404b8ac2a5e1187d79164992e4483 (on 2018-03-09).

I would like to CC its author, Thomas Wolff, but he gave an invalid
email address <mintty@xxxxxxxxxxxxxxxxxxxxxxxx> in the commit.

This regression was found by gnulib's test suite


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