Rewrite instances of "pythonX.X", "pyX.X", etc in tarball listings

This leads to significantly smaller diffs in instances like major distro releases where the Python version moves from something like 3.9 to 3.10 (and a large portion of the diff is then just directory renames as a result).

diff-pr.sh

@@ -236,6 +236,8 @@ copy-tar() {
 								tar -tf "$dstG" \
 									| grep -vE "$uninterestingTarballGrep" \
 									| sed -e 's!^[.]/!!' \
+										-r \
+										-e 's!([/.-]|^)((lib)?(c?python|py)-?)[0-9]+([.][0-9]+)?([/.-]|$)!\1\2XXX\6!g' \
 									| sort \
 									> "$dstG  'tar -t'"
 							fi