fix strsignal decl

[Jeff Johnston]

Yes, please go ahead.

-- Jeff J.

Eric Blake wrote:
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> OK to apply?  Only cygwin is impacted by this bug-fix.
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> 2008-06-18  Eric Blake  <ebb9@byu.net>
>
>     Per Posix, strsignal returns non-const char*.
>     * libc/include/string.h (strsignal): Fix return type.
>
> - --
> Don't work too hard, make some time for fun as well!
>
> Eric Blake             ebb9@byu.net
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