changes in sbcl-2.4.1 relative to sbcl-2.4.0:

  * enhancement: compact instance headers are partially supported with the
    mark-region parallel garbage collector.
  * enhancement: functions with declared return types have their return values
    type-checked in optimization regimes with high SAFETY and (DEBUG 3).
  * platform support:
    ** disable ASLR on FreeBSD.  (lp#2047655, thanks to Konstantin Belousov)
    ** link to libpthread on FreeBSD.  (thanks to Konstantin Belousov)
    ** restore build on 64-bit riscv.  (lp#2034713, lp#2048869, reported by
       Guillaume LE VAILLANT)
    ** restore build on 64-bit ppc.
    ** fix case in referring to a header file.  (lp#2047726, thanks to Andrew Kravchuk)
    ** the fastrem-32 feature (for optimized computations of FLOOR) is now
       available on all platforms.
  * bug fix: resweep moved lines after compaction in the mark-region parallel
    garbage collector.
  * bug fix: infinite loops in the compiler on some constructs with SATISFIES
    types.  (lp#2047289, lp#2047706, lp#2049631)
  * optimization: various hash tables implementing part of the system
    (packages, Unicode data tables) have been converted to use perfect hash
    functions.
  * optimization: TYPECASE on structure class hierarchies is implemented using
    a perfect hash.
  * optimization: eliminate bound checks with relative offsets.  (lp#1830314)
  * optimization: the compiler has more knowledge of how to optimize
    DIGIT-CHAR.
  * optimization: the compiler can elide intermediates for some calls to
    APPLY, CONCATENATE and MAKE-ARRAY with arguments that are freshly-consed
    modifications of existing sequences.
  * optimization: (LOOP FOR X IN (REVERSE LIST) ...) is now faster and conses
    less.
  * optimization: (LOOP ... APPEND ...) is more compact, and does less work if
    appending NIL.
  * optimization: type tests of various array types are faster and shorter.
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