Support symlinks in ~/common-lisp/

[fosskers]

Describe the bug

When running (asdf:load-system :foo) when the foo system exists in a folder symlinked within ~/common-lisp/, Clasp fails to load the system.

Expected behavior

The system should load. Note this works in SBCL, ECL, and ABCL, but not CCL. Related issue for CCL.

Actual behavior

The system fails to load, citing the condition MISSING-COMPONENT.

Context

I'm using Clasp 2.2.0 on Arch Linux.