bpo-40302: Add _Py_bswap32() function to pyport.h by vstinner · Pull Request #19552 · python/cpython

Add a new internal pycore_byteswap.h header file with the following
functions:

* _Py_bswap16()
* _Py_bswap32()
* _Py_bswap64()

Use these functions in _ctypes, sha256 and sha512 modules.
Also use it in the UTF-32 encoder.

sha256, sha512 and _ctypes modules are now built with the internal C
API.

* master: (1985 commits)
  bpo-40179: Fix translation of #elif in Argument Clinic (pythonGH-19364)
  bpo-35967: Skip test with `uname -p` on Android (pythonGH-19577)
  bpo-40257: Improve help for the typing module (pythonGH-19546)
  Fix two typos in multiprocessing (pythonGH-19571)
  bpo-40286: Use random.randbytes() in tests (pythonGH-19575)
  bpo-40286: Makes simpler the relation between randbytes() and getrandbits() (pythonGH-19574)
  bpo-39894: Route calls from pathlib.Path.samefile() to os.stat() via the path accessor (pythonGH-18836)
  bpo-39897: Remove needless `Path(self.parent)` call, which makes `is_mount()` misbehave in `Path` subclasses. (pythonGH-18839)
  bpo-40282: Allow random.getrandbits(0) (pythonGH-19539)
  bpo-40302: UTF-32 encoder SWAB4() macro use a|b rather than a+b (pythonGH-19572)
  bpo-40302: Replace PY_INT64_T with int64_t (pythonGH-19573)
  bpo-40286: Add randbytes() method to random.Random (pythonGH-19527)
  bpo-39901: Move `pathlib.Path.owner()` and `group()` implementations into the path accessor. (pythonGH-18844)
  bpo-40300: Allow empty logging.Formatter.default_msec_format. (pythonGH-19551)
  bpo-40302: Add pycore_byteswap.h header file (pythonGH-19552)
  bpo-40287: Fix SpooledTemporaryFile.seek() return value (pythonGH-19540)
  Minor modernization and readability improvement to the tokenizer example (pythonGH-19558)
  bpo-40294: Fix _asyncio when module is loaded/unloaded multiple times (pythonGH-19542)
  Fix parameter names in assertIn() docs (pythonGH-18829)
  bpo-39793: use the same domain on make_msgid tests (python#18698)
  ...