* Move <ctype.h>, <limits.h> and <stdarg.h> includes to Python.h.
* Move "pystats.h" include from object.h to Python.h.
* Remove redundant "pymem.h" include in objimpl.h and "pyport.h"
  include in pymem.h; Python.h already includes them earlier.
* Remove redundant <wchar.h> include in unicodeobject.h; Python.h
  already includes it.
* Move _SGI_MP_SOURCE define from Python.h to pyport.h.
* pycore_condvar.h includes explicitly <unistd.h> for the
  _POSIX_THREADS macro.

* Move <ctype.h>, <limits.h> and <stdarg.h> standard includes to
  Python.h.
* Move "pystats.h" include from object.h to Python.h.
* Remove redundant "pymem.h" include in objimpl.h and "pyport.h"
  include in pymem.h; Python.h already includes them earlier.
* Remove redundant <wchar.h> include in unicodeobject.h; Python.h
  already includes it.
* Move _SGI_MP_SOURCE define from Python.h to pyport.h.
* pycore_condvar.h includes explicitly <unistd.h> for the
  _POSIX_THREADS macro.

* Move <ctype.h>, <limits.h> and <stdarg.h> standard includes to
  Python.h.
* Move "pystats.h" include from object.h to Python.h.
* Remove redundant "pymem.h" include in objimpl.h and "pyport.h"
  include in pymem.h; Python.h already includes them earlier.
* Remove redundant <wchar.h> include in unicodeobject.h; Python.h
  already includes it.
* Move _SGI_MP_SOURCE define from Python.h to pyport.h.
* pycore_condvar.h includes explicitly <unistd.h> for the
  _POSIX_THREADS macro.

* Move <ctype.h>, <limits.h> and <stdarg.h> standard includes to
  Python.h.
* Move "pystats.h" include from object.h to Python.h.
* Remove redundant "pymem.h" include in objimpl.h and "pyport.h"
  include in pymem.h; Python.h already includes them earlier.
* Remove redundant <wchar.h> include in unicodeobject.h; Python.h
  already includes it.
* Move _SGI_MP_SOURCE define from Python.h to pyport.h.
* pycore_condvar.h includes explicitly <unistd.h> for the
  _POSIX_THREADS macro.

Replace "MacOSX" with "macOS".

Python.h no longer includes these standard header files: <time.h>,
<sys/select.h> and <sys/time.h>. They should now be included
explicitly if needed.

Remove prototypes for old Solaris and old QNX versions from pyport.h.

Move prototypes of gethostname(), _getpty() and struct termios from
pyport.h to the C code using them: posixmodule.c, socketmodule.c and
termios.c.

Replace "#ifdef SOLARIS" with "#ifdef __sun".

* Move <ctype.h>, <limits.h> and <stdarg.h> standard includes to
  Python.h.
* Move "pystats.h" include from object.h to Python.h.
* Remove redundant "pymem.h" include in objimpl.h and "pyport.h"
  include in pymem.h; Python.h already includes them earlier.
* Remove redundant <wchar.h> include in unicodeobject.h; Python.h
  already includes it.
* Move _SGI_MP_SOURCE define from Python.h to pyport.h.
* pycore_condvar.h includes explicitly <unistd.h> for the
  _POSIX_THREADS macro.

Remove also the HAVE_IEEEFP_H macro: remove ieeefp.h from the
AC_CHECK_HEADERS() check of configure.ac.

Move prototypes of gethostname(), _getpty() and struct termios from
pyport.h to the C code using them: posixmodule.c, socketmodule.c and
termios.c.

Replace "#ifdef SOLARIS" with "#ifdef __sun".

Remove <ctype.h> in C files which don't use it; only sre.c and
_decimal.c still use it.

Remove _PY_PORT_CTYPE_UTF8_ISSUE code from pyport.h:

* Code added by commit b5047fd
  in 2004 for MacOSX and FreeBSD.
* Test removed by commit 52ddaef
  in 2007, since Python str type now uses locale independent
  functions like Py_ISALPHA() and Py_TOLOWER() and the Unicode
  database.

Modules/_sre/sre.c replaces _PY_PORT_CTYPE_UTF8_ISSUE with new
functions:

* sre_isalnum()
* sre_tolower()
* sre_toupper()

Remove unused includes:

* _localemodule.c: remove <stdio.h>.
* getargs.c: remove <float.h>.
* dynload_win.c: remove <direct.h>, it no longer calls _getcwd()
  since commit fb1f68e (in 2001).

Remove <ctype.h> in C files which don't use it; only sre.c and
_decimal.c still use it.

Remove _PY_PORT_CTYPE_UTF8_ISSUE code from pyport.h:

* Code added by commit b5047fd
  in 2004 for MacOSX and FreeBSD.
* Test removed by commit 52ddaef
  in 2007, since Python str type now uses locale independent
  functions like Py_ISALPHA() and Py_TOLOWER() and the Unicode
  database.

Modules/_sre/sre.c replaces _PY_PORT_CTYPE_UTF8_ISSUE with new
functions: sre_isalnum(), sre_tolower(), sre_toupper().

Remove unused includes:

* _localemodule.c: remove <stdio.h>.
* getargs.c: remove <float.h>.
* dynload_win.c: remove <direct.h>, it no longer calls _getcwd()
  since commit fb1f68e (in 2001).

There is no API change, since pyport.h includes exports.h.

There is no API change, since pyport.h includes exports.h.

…108855)

There is no API change, since pyport.h includes exports.h.

Mention one symbol imported by each #include.

unistd.h is needed by alarm() and pause().

unistd.h is needed by alarm() and pause().

unistd.h is needed by alarm() and pause() functions.

…hon#111402)

unistd.h is needed by alarm() and pause() functions.

In practice, only Windows is impacted, since the HAVE_STDDEF_H macro
was only defined on this platform.

In practice, only Windows is impacted, since the HAVE_STDDEF_H macro
was only defined on this platform.

In practice, only Windows is impacted, because the HAVE_STDDEF_H
macro was only defined on Windows.

In practice, only Windows is impacted, because the HAVE_STDDEF_H
macro was only defined on Windows.

…ython#111563)

In practice, only Windows is impacted, because the HAVE_STDDEF_H
macro was only defined on Windows.