Remove check of ctype.h include in safe-ctype.h?

Would it work to instead #poison isalpha et al in gcc/system.h? Then
remove the check from safe-ctype.h altogether.

I think it would work. But why putting these pragmas outside of
safe-ctype.h? How about putting them at the end of safe-ctype.h
instead?

( I think there are several system.h files (like one in libcpp,
etc). We'd need to do the poison in all of them (but not in
tsystem.h).

Yep, noticed that.

I don't know if this solves the darwin problem or not. Also, this has
the disadvantage in that users of safe-ctype.h other than GCC will not
have the check.

Putting the #poison in safe-ctype.h would take care of that concern.

--
Joel