bug#27222: emacs-build-system install phase doesn't honor directory hierarchy

[Maxim Cournoyer]

It seems the recent changes made to the emacs-build-system broke
ert-runner; it always output the following:

Invalid reporter: dot

A quick investigation revealed that ert-runner.el is looking for
reporters under the reporters/ sudbdirectory. Here's the arborescence in
the original source:

--8<---------------cut here---------------start------------->8---
find . -name '*.el'
./reporters/ert-runner-reporter-ert.el
./reporters/ert-runner-reporter-dot.el
./features/step-definitions/ert-runner-steps.el
./features/support/env.el
./ert-runner.el
./ert-compat.el
--8<---------------cut here---------------end--------------->8---

And here's what got installed in the store:

--8<---------------cut here---------------start------------->8---
find . -name '*.el'
./ert-runner-autoloads.el
./ert-runner.el
./ert-compat.el
--8<---------------cut here---------------end--------------->8---

I'm guessing the current inclusion regexp:
(include '("^[^/]*\\.el$" "^[^/]*\\.info$" "^doc/.*\\.info$"))

must be extended/adapted.

What should "^[^/]*\\.el$" become?

I've tried ".*\\.el" without success.

Ideas?

Maxim