IRSL: Add paths for Intel oneAPI compilers on Linux

They are stored in a slightly different place with oneAPI than they
used to be in PSXE.

A similar change was made for Windows by commit 956160bb9a (IRSL: Fix
search for Windows redist files with Intel Classic compiler, 2021-09-23,
v3.22.0-rc1~88^2), which left a comment about the locations relative to
the Classic and oneAPI compilers.

Fixes: #23310