[bug#51903] cmn license etc

[bil]

The license entry in cmn.asd is incorrect -- I never
noticed that Rick Taube specified GPL.  The BSD
or MIT licenses are ok.  I wrote all of cmn; Rick was
just helping by adding the asd file, and I paid no
attention to it.  We weren't so concerned with licenses
in those days.  (I'll update the ccrma tarball).

cmn-all.lisp builds cmn fine for me -- is the problem
the directory?  Also to run it you need to be in
the cmn package.

Thanks for your interest in this software!