make numexpr easyblock aware of toolchain with GCC + imkl

[boegel]

(created using eb --new-pr)

[boegel]

Test report by @boegel

Overview of tested easyconfigs (in order)

• SUCCESS numexpr-2.7.1-foss-2019b-Python-3.7.4.eb
• SUCCESS numexpr-2.7.1-intel-2019b-Python-2.7.16.eb
• SUCCESS numexpr-2.7.1-foss-2020a-Python-3.8.2.eb
• SUCCESS numexpr-2.7.1-intel-2020a-Python-3.8.2.eb
• SUCCESS SciPy-bundle-2022.05-intel-2022a.eb
• SUCCESS SciPy-bundle-2022.05-foss-2022a.eb
• SUCCESS SciPy-bundle-2021.10-foss-2021b-Python-2.7.18.eb
• SUCCESS SciPy-bundle-2021.05-intel-2021a.eb
• SUCCESS SciPy-bundle-2021.05-foss-2021a.eb
• SUCCESS numexpr-2.8.1-foss-2021a.eb
• SUCCESS numexpr-2.8.1-intel-2021a.eb

Build succeeded for 11 out of 11 (11 easyconfigs in total)
node3104.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/e5ce3d0719a0f9985a2e4f61f978d5a8 for a full test report.