Improve error handling for non-existing macos intel versions

[iulusoy]

The error handling for combinations macOS, intel, 2023.1 and other non-existing intel compiler versions for macos could be improved, at least an error message stating that this version is not available on macOS.

[wpbonelli]

Thanks @iulusoy, the README stated we fell back to intel-classic if mac and intel but we did not. See #70