Adding general way to handle filtered deps when installing software

[Crivella]

Right now every time a software that relies on calling get_software_root for a filtered deps is called requires and ad-hoc fix via an hook.

This is a proposed way to automatically point the respective $EBROOT... variable to the compat layer for every filtered deps.

TODO / Ideas

• Would need also to remove the customization done in other hooks
• Possibly recognize only deps filtered specifically by EESSI instead of relying on `build_option('filter_deps')
• Alternatively or together to previous point, implement better logic for filter_deps as in framework
• Could/Should this be performed at an earlier step the pre_configure?

[Crivella]

Beside the new LLVM hook #1093 this behavior seems to be present only in the Score-P and Extrae hooks that need the location of binutils.

The structure of the binutils installation in the compat layer is different from a normal Easybuild ones

• $EPREFIX/usr/lib*/binutils/-linux-gnu/2./
  • library files
  • include/
    • headers

VS

• $EBROOT/
  • lib/
    • library files
  • include/
    • headers

This would probably require having a way to deal with different folder structure in the EBlocks and setting the variables in a dedicated way for every filtered deps

EG since Score-P Easyblock relies on get_software_libdir to find the libraries (by searching in lib and lib64 inside of get_software_root the current solution would not be able to work

[boegel]

This is a pretty big hammer, I would rather see us handle this case by case, as is being done in #1093