also support using full path soname for shared libraries as alternative to using RPATH

[boegel]

see https://stoppels.ch/2022/08/04/stop-searching-for-shared-libraries.html

[ocaisa]

I just thought of the perfect use case for this in EESSI. When using MPItrampoline, this would allow you to explicitly get back to the host system libraries that are required to make a drop in MPI replacement work without having to open the door to all of the system libraries.

[ocaisa]

There is an argument though for not always using it. In #3650, we opened the door to allowing people to override rpaths and that use case is still valid. So, you would want a way to disable this in an easyconfig.

I imagine the implementation could be done inside the current set of wrappers. For the exclusion of a particular path, you'd need to have a pathlike envvar set that can be used to filter from LIBRARY_PATH.