work around installation problem for extensions in Python 2.7.16 easyconfig due to missing build-backend spec in pyproject.toml

[boegel]

(created using eb --new-pr)

[boegel]

@boegelbot please test @ generoso

[boegelbot]

@boegel: Request for testing this PR well received on login1

PR test command 'EB_PR=16490 EB_ARGS= EB_CONTAINER= /opt/software/slurm/bin/sbatch --job-name test_PR_16490 --ntasks=4 /tmp/boegelbot/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 9378

Test results coming soon (I hope)...

- notification for comment with ID 1291070239 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
cnx1 - Linux Rocky Linux 8.5, x86_64, Intel(R) Xeon(R) CPU E5-2690 v3 @ 2.60GHz (haswell), Python 3.6.8
See https://gist.github.com/e0bbad940d43b52ef3d54012384a31c4 for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 1 out of 1 (1 easyconfigs in total)
node3106.skitty.os - Linux RHEL 8.4, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/210f6e689c961fc556cc5580588e6c26 for a full test report.

[smoors]

lgtm

[smoors]

Going in, thanks @boegel!