make OpenBLAS respect the parallelism set by EasyBuild

[Flamefire]

OpenBLAS builds in parallel by default using all cores it finds. Passing MAKE_NB_JOBS=-1 makes it respect make -j<n>

[migueldiascosta]

lgtm

[migueldiascosta]

Test report by @migueldiascosta

Overview of tested easyconfigs (in order)

• SUCCESS OpenBLAS-0.3.0-GCC-6.4.0-2.28.eb
• SUCCESS OpenBLAS-0.3.0-GCC-7.3.0-2.30.eb
• SUCCESS OpenBLAS-0.3.1-GCC-7.3.0-2.30.eb
• SUCCESS OpenBLAS-0.3.3-GCC-8.2.0-2.31.1.eb
• SUCCESS OpenBLAS-0.3.4-GCC-8.2.0-2.31.1.eb
• SUCCESS OpenBLAS-0.3.5-GCC-8.2.0-2.31.1.eb
• SUCCESS OpenBLAS-0.3.6-GCC-8.3.0-2.32.eb
• SUCCESS OpenBLAS-0.3.7-GCC-8.3.0.eb
• SUCCESS OpenBLAS-0.3.8-GCC-9.2.0.eb
• SUCCESS OpenBLAS-0.3.9-GCC-9.3.0.eb

Build succeeded for 10 out of 10 (10 easyconfigs in total)
sms - Linux centos linux 7.6.1810, x86_64, AMD EPYC 7601 32-Core Processor (zen), Python 2.7.5
See https://gist.github.com/bb952d6a5e4aad9c007d6d90b33f6aa0 for a full test report.

[migueldiascosta]

lgtm

[migueldiascosta]

Going in, thanks @Flamefire!

[migueldiascosta]

Test report by @migueldiascosta

Overview of tested easyconfigs (in order)

• SUCCESS OpenBLAS-0.3.9-GCC-9.3.0.eb
• SUCCESS ScaLAPACK-2.1.0-gompi-2020a.eb

Build succeeded for 2 out of 2 (2 easyconfigs in total)
sms - Linux centos linux 7.6.1810, x86_64, AMD EPYC 7601 32-Core Processor (zen), Python 2.7.5
See https://gist.github.com/9f344eade46f6386c343e11d8b0a26ff for a full test report.