changes in sbcl-1.4.5 relative to sbcl-1.4.4:

  * minor incompatible change: building with/without the :sb-package-locks
    feature is no longer an option. Package locks are always compiled in,
    and removing :sb-package-locks from *features* will have no effect.
  * enhancement: FIND-PACKAGE does not acquire a mutex
  * enhancement: cheneygc can perform heap relocation on startup
  * enhancement: in threaded builds, finalizers execute in a system-internal
    thread so that a user thread which invokes GC is unblocked from performing
    work as soon it returns from GC and invokes any post-GC hooks.
    As such, it is more important than before to avoid assumptions about
    special variable bindings in finalizers, even in single-threaded code.
  * optimization: faster (funcall (or function symbol)) on x86-64.
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