Consider reverting the autoconf 2.72 version bump requirement as it breaks compatibility with distros

Bug report

Bug description:

autoconf minimum requirement was bumped to 2.72 through https://github.com/python/cpython/issues/115765

This breaks configure regeneration for CentOS Stream 9/RHEL9 (shipping 2.69 and extra 2.71) and CentOS Stream 10/RHEL10 (shipping 2.71). I presume other distros as well. We currently patch our spec files, lowering the version (to 2.69 and 2.71) makes them work fine.

I (re)discovered the issue by doing some testing on the newly added CentOS Stream buildbot.

And as far as I can see there is nothing used from 2.72, no functional changes. Requiring 2.72 is too aggressive and it seems it was not tested on any major distros at the time.

CPython versions tested on:

CPython main branch, 3.16, 3.15, 3.14

Operating systems tested on:

Linux

檢查 issue 115765 引入的 autoconf 最低版本變更，以及該變更影響的 configure 重新產生路徑。在提到的 CentOS Stream 9/RHEL 9 和 CentOS Stream 10/RHEL 10 環境中重現建置，然後驗證受支援的發行版版本無需修改 spec files 即可正常運作。