Trac #33155: Broken install using system pythons < 3.10 from python.org macOS packages

As reported in https://groups.google.com/g/sage-
release/c/gTNMEVbzb6M/m/2lXjD6tFAgAJ:

Installation of pplpy fails:
{{{
ERROR: pplpy-0.8.6-cp39-cp39-macosx_11_0_x86_64.whl is not a supported
wheel on this platform."
}}}
(`wheel` uses this tag based on the inspection of the deployment targets
of the built dynamic libraries - this is done in
https://github.com/pypa/wheel/blob/main/src/wheel/macosx_libfile.py)

The wheel tagged such then does not pass the compatibility test because
of:
pypa/packaging#497

Ingredients of this bug:
- https://docs.python.org/3/library/platform.html#macos-platform
-
https://github.com/pypa/pip/blob/main/src/pip/_vendor/packaging/tags.py
(vendored version of `packaging`)

URL: https://trac.sagemath.org/33155
Reported by: mkoeppe
Ticket author(s): Matthias Koeppe
Reviewer(s): Dima Pasechnik

Author: Release Manager

build/bin/sage-pip-install

@@ -30,6 +30,11 @@ PIP=pip3
 # running pip. This is implemented in the Python script sage-flock
 LOCK="$SAGE_LOCAL/var/lock/$PIP.lock"
 
+# Trac #33155: Pythons installed using the python.org macOS installers
+# for Python < 3.10 identify macOS Big Sur and newer as "10.16", causing
+# pip to refuse to install wheels tagged macosx_11_0_x86_64
+export SYSTEM_VERSION_COMPAT=0
+
 # Finally actually do the installation (the "SHARED" tells pip2/3-lock
 # to apply a shared lock)
 sage-flock -s $LOCK $PYTHON -m pip install $pip_install_flags "$@"

build/pkgs/configure/checksums.ini

@@ -1,4 +1,4 @@
 tarball=configure-VERSION.tar.gz
-sha1=04ea0aba601daa81d8f840f8bab94a22d3c3744b
-md5=c83199b816e177cce63699cdf9787347
-cksum=411599226
+sha1=2f464579d16393f5f1aef59355c639a038472c98
+md5=3ee485b7894abb2c7b025f84a68508b1
+cksum=2582706230

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-b87c1e67b632d87df82a66cc0ae259d3a63b9ca8
+7fd88116e4d200b760f7d38523ce65927044c815