patch Pillow's setup.py rather than hardcoding system paths in $CPATH and $LIBRARY_PATH

[boegel]

(created using eb --new-pr)

I don't like to add system paths to $CPATH and $LIBRARY_PATH, so implemented the suggestion I made in #19226

[ocaisa]

@boegelbot please test @ jsc-zen2

[boegelbot]

@ocaisa: Request for testing this PR well received on jsczen2l1.int.jsc-zen2.easybuild-test.cluster

PR test command 'EB_PR=19267 EB_ARGS= EB_REPO=easybuild-easyconfigs /opt/software/slurm/bin/sbatch --mem-per-cpu=4000M --job-name test_PR_19267 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen2.sh' executed!

• exit code: 0
• output:

Submitted batch job 3760

Test results coming soon (I hope)...

- notification for comment with ID 1819230494 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).

[ocaisa]

@boegelbot please test @ generoso

[boegelbot]

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

PR test command 'EB_PR=19267 EB_ARGS= EB_CONTAINER= EB_REPO=easybuild-easyconfigs /opt/software/slurm/bin/sbatch --job-name test_PR_19267 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 12196

Test results coming soon (I hope)...

- notification for comment with ID 1819239470 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 13 out of 13 (13 easyconfigs in total)
cns3 - Linux Rocky Linux 8.5, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz (haswell), Python 3.6.8
See https://gist.github.com/boegelbot/a98619d9b906bd3524ef43c2ba4ce42e for a full test report.

[boegelbot]

Test report by @boegelbot
FAILED
Build succeeded for 12 out of 14 (13 easyconfigs in total)
jsczen2c1.int.jsc-zen2.easybuild-test.cluster - Linux Rocky Linux 8.5, x86_64, AMD EPYC 7742 64-Core Processor (zen2), Python 3.6.8
See https://gist.github.com/boegelbot/0220984899740dd224a57c0914182236 for a full test report.

[ocaisa]

Thanks for the update @boegel