my_pypack_linux.sh: repair the Python wheel on Linux (PEP 599)

Linux wheels must be converted further to 'manylinux' wheels, before uploading
to PyPI repository.

* See "PEP 599 - The manylinux2014 Platform Tag" <https://peps.python.org/pep-0599>
* See <https://stackoverflow.com/q/46599004>

devtools/deploy/linux/mk_pypack_linux.sh.in

@@ -129,5 +129,35 @@ done
 echo "$TITLE: Making the Python wheel..."
 $PYTHON -m pip wheel "$pyoutdir" --no-deps --wheel "$wheeldir"
 
+#-- repair the Python wheel via auditwheel
+# NOTE:
+# Linux wheels must be converted further to 'manylinux' wheels, before uploading
+# to PyPI repository.
+# See "PEP 599 - The manylinux2014 Platform Tag" <https://peps.python.org/pep-0599>
+# See <https://stackoverflow.com/q/46599004>
+
+# NOTE:
+# The output of auditwheel (as of v5.3.0) is like:
+#  ```
+#  SomeWheel.whl is consistent with the
+#  following platform tag: "linux_x86_64".
+#  ...
+#  This constrains the platform tag to "manylinux_2_35_x86_64". In order
+#  to achieve a more compatible tag, you would need to recompile a new
+#  wheel from source on a system with earlier versions of these
+#  ```
+# The platform tag must be retrieved from this text.
+
+# path to the produced wheel
+wheelname=$(ls $wheeldir)
+wheelpath="$wheeldir/$wheelname"
+echo "$TITLE: repairing wheel '${wheelpath}' via auditwheel..."
+# regex to extract the platform tag; eg.,
+# 'constrains the platform tag to "manylinux_2_35_x86_64"' => 'manylinux_2_35_x86_64'
+platform_tag=$($PYTHON -m auditwheel show "$wheelpath" | sed -nE 's/.+constrains the platform tag to "(.+)".+/\1/p')
+echo "$TITLE: platform tag for '${wheelpath}' = '${platform_tag}'"
+# repair the wheel
+$PYTHON -m auditwheel repair --plat "${platform_tag}" --wheel-dir "${wheeldir}/manylinux/" "${wheelpath}"
+
 # final message
 echo "$TITLE: Done."