Environment variable change in module cray-libsci of CPE 23.12

[lucamar]

Hi, I report a bug affecting EasyBuild on Cray systems (file libsci.py) with the Cray Programming Environment (CPE) 23.12. The bug should be fixed in CPE 24.03 according to HPE/Cray staff, therefore the impact is limited:

• The environment variable name referenced in line 68 changed from CRAY_LIBSCI_PREFIX_DIR to CRAY_PE_LIBSCI_PREFIX_DIR
• I have manually fixed line 69 using the workaround below:
  root = os.getenv('CRAY_LIBSCI_PREFIX_DIR', None) or os.getenv('CRAY_PE_LIBSCI_PREFIX_DIR', None)

The environment variable name should be fixed back to the original one in CPE 24.03 (I did not have the chance to test it yet, though). Since CPE variable names change sometimes, it might be useful to give the option to read the prefix of the external module cray-libsci from a metadata file instead of having it hard coded.

[boegel]

@lucamar Do you think it's worth also considering $CRAY_PE_LIBSCI_PREFIX_DIR as a fallback in libsci.py to dance around this? That's a pretty easy change...

[lucamar]

Thanks @boegel: yes, that's likely the quickest workaround, that I've also implemented manually. Hopefully this bug will only affect CPE 23.12, as reported by HPE staff