Fixes for package lock errors in listener compilation/load

[Paolo Amoroso]

The package lock errors during the compilation or load of the CLIM
Listener, with recent versions of CMUCL in the 19a prerelease or
release series, can be fixed by adding this form somewhere at the
beginning of Apps/Listener/cmu-hacks.lisp:

#+cmu19a
(progn (setf (ext:package-definition-lock (find-package "DEBUG")) nil)
       (setf (ext:package-definition-lock (find-package "COMMON-LISP")) nil)
       (setf (ext:package-definition-lock (find-package "EXT")) nil))

or perhaps:

#+cmu19a (ext:unlock-all-packages)


Paolo
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