sbcl 1.0.54

SBCL 1.0.54 has been released with the following changes:

changes in sbcl-1.0.54 relative to sbcl-1.0.53:
  * minor incompatible changes:
    ** RENAME-FILE on a symbolic links used to rename the linked-to file
       instead of the link.
    ** DELETE-DIRECTORY on symbolic link to a directory used to delete the
       directory, but now signal an error instead. Use TRUENAME to resolve the
       pathname if you wish to delete the linked directory, and DELETE-FILE if
       you wish to delete the
    ** The internal SB-THREAD::SPINLOCK API has been deprecated, and using
       symbols associated with it will trigger a compile-time warning.
  * thread-related enhancements:
    (This work has been funded by the SBCL Threading 2011 IndieGoGo campaign.
     Many thanks to generous donors!)
    ** Threading is now more reliable on non-Linux platforms. We still don't
       consider threads on non-Linux platforms good enough to enable them by
       default, but they're in a clearly better shape now.
    ** Deadlines supported now on all platforms.
    ** All blocking functions in the threading API now have a :TIMEOUT
       argument.
    ** Semaphore notification objects have been added to SB-THREAD.
    ** SB-CONCURRENCY contrib now includes Allegro-style GATE objects.
    ** SB-EXT:COMPARE-AND-SWAP has been extended to support SLOT-VALUE,
       STANDARD-INSTANCE-ACCESS, and FUNCALLABLE-STANDARD-INSTANCE-ACCESS.
    ** Users can now defined new places usable with SB-EXT:COMPARE-AND-SWAP
       using an API anologous to defining new SETFable places.
  * GC-related enhancements and bug fixes:
    ** --dynamic-space-size and --control-stack-size now understand Kb, Mb,
         and Gb suffixes. Default is megabytes as before.