tests-termios.c was failing on more than just cygwin.
* doc/posix-headers/termios.texi (termios.h): Mention problem.
* lib/termios.in.h (include): Ensure pid_t on all platforms, not
just when building tcgetsid.
Signed-off-by: Eric Blake <eblake@redhat.com>
* m4/termios_h.m4 (gl_TERMIOS_H_DEFAULTS): Set default.
(gl_TERMIOS_H): Adjust it on mingw.
* modules/termios (Makefile.am): Substitute new key.
* lib/termios.in.h (includes): Make include_next conditional.
* doc/posix-headers/termios.texi (termios.h): Update
documentation.
Reported by Daniel P. Berrange.
Signed-off-by: Eric Blake <eblake@redhat.com>