Bug report

Bug description:

configure.ac is missing a line contiunation character, so the resulting configure script will fail when autoconf needs to recreate it.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-137390: Add missing line continuation character in configure.ac #137391
• [3.14] gh-137390: Add missing line continuation character in configure.ac (GH-137391) #137394