gh-93202: Always use %zd printf formatter

[vstinner]

Python now always use the %zu and %zd printf formats to
format a size_t or Py_ssize_t number. Building Python 3.12 requires a
C11 compiler, so these printf formats are now always supported.

• PyObject_Print() and _PyObject_Dump() now use the printf %zd format
  to display an object reference count.
• Update PY_FORMAT_SIZE_T comment.
• Remove outdated notes about the %zd format in PyBytes_FromFormat()
  and PyUnicode_FromFormat() documentations.
• configure no longer checks for the %zd format and no longer defines
  PY_FORMAT_SIZE_T macro in pyconfig.h.
• pymacconfig.h no longer undefines PY_FORMAT_SIZE_T: macOS 10.4 is
  no longer supported. Python 3.12 now requires macOS 10.6 (Snow
  Leopard) or newer.

[vstinner]

@Yhg1s: Better late than never! The XXX note was added in 2006 by commit 8b87a0b ;-)

[vstinner]

@methane: Would you mind to review this change?

I found more code to update. I completed my PR. I created the issue #93202 and I added a NEWS entry just in case (if someone gets a build error).

[methane]

LGTM.
Would you add "test-with-buildbot" label before merging this?

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @vstinner for commit 8c6742f 🤖

If you want to schedule another build, you need to add the ":hammer: test-with-buildbots" label again.

[vstinner]

Would you add "test-with-buildbot" label before merging this?

Sure! That's a good idea!

[erlend-aasland]

lgtm

[vstinner]

I'm not sure why the list of pending buildbot jobs is still long 3 hours later. But remaining jobs are very similar of already completed jobs, I don't think that it's worth it to wait for them.

test_launcher is failing on a Windows job, but it's a known and unrelated issue: #93005

So far so good, there is no build error.

[vstinner]

I also removed this note in the doc as part of this change:

.. % Similar comments apply to the %ll width modifier and

The ll printf specifier (ex: %lli) is also part of C99.

[vstinner]

Thanks for the review @methane and @erlend-aasland! It's now merged.