fix failing 'make check' for MPFR 4.x when installing with 'eb --rpath'

[boegel]

(created using eb --new-pr)

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in this PR)
node3170.skitty.os - Linux centos linux 7.8.2003, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/a07ea83403cfcbad9575604ee5f1e3f0 for a full test report.

[boegel]

@boegelbot please test @ generoso
EB_ARGS="MPFR-4.0.1-GCCcore-7.3.0.eb MPFR-4.0.2-GCCcore-8.2.0.eb MPFR-4.0.2-GCCcore-8.3.0.eb MPFR-4.0.2-GCCcore-9.3.0.eb --rpath -f --installpath /tmp/pr11187"

[boegel]

Don't merge this yet please, needs more love...

[boegelbot]

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

PR test command 'EB_PR=11187 EB_ARGS="MPFR-4.0.1-GCCcore-7.3.0.eb MPFR-4.0.2-GCCcore-8.2.0.eb MPFR-4.0.2-GCCcore-8.3.0.eb MPFR-4.0.2-GCCcore-9.3.0.eb --rpath -f --installpath /tmp/pr11187" /apps/slurm/default/bin/sbatch --job-name test_PR_11187 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 5212

Test results coming soon (I hope)...

Details

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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).

[boegel]

Should be good to go now...

[boegelbot]

Test report by @boegelbot
SUCCESS
Build succeeded for 4 out of 4 (4 easyconfigs in this PR)
generoso-x-3 - Linux centos linux 8.2.2004, x86_64, Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz (haswell), Python 3.6.8
See https://gist.github.com/d6bb411a86f9587ffc5ff7f2a215c62d for a full test report.

[boegel]

Test report by @boegel
SUCCESS
Build succeeded for 5 out of 5 (5 easyconfigs in this PR)
node3108.skitty.os - Linux centos linux 7.8.2003, x86_64, Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz (skylake_avx512), Python 3.6.8
See https://gist.github.com/0485b42e474649ee86febaaf1162d5c8 for a full test report.

[smoors]

lgtm

[smoors]

Going in, thanks @boegel!