devel/cl-asdf: Update to 3.3.7

This update also fixes the problem that SBCL would disable the port ASDF
in favor of its older, bundled ASDF. SBCL did this because the port was
not installing version.lisp-expr.

PR: 243176
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D37634