`SHELL=/bin/sh -e` can cause failures when `Makefile` re-runs `./configure`

[zware]

Bug report

Since the change in GH-100328 to make SHELL=/bin/sh -e rather than just /bin/sh, ./configure can fail in some cases when re-run by the config.status recipe in Makefile.

Your environment

• Any environment where ./configure can execute a failing non-checked command, including common macOS environments

Failure originally reported and culprit found by @gvanrossum via Discord.

Linked PRs

• gh-103776: Remove explicit uses of $(SHELL) from Makefile #103778