Re: 21.3.50 for Cygwin: patch 5

[Richard Stallman]

      There are other files in
    lwlib/ (e.g. xlwmenu.c) and src/ (e.g. gmalloc.c, mktime.c,
    and others) which uses __P as well.

For gmalloc.c and mktime.c, this was probably because they were copied
from Glibc, which can legitimately use names like __P.  (There's one
exception: unexalpha.c.)

In some sense we ought to change these files not to use __P when
moving the code outside Glibc, but that is unfortunate since it would
require a fork.

However, it would be better to use P_ instead in the other files.
That is more consistent with the rest of Emacs, and with the C standard.