sbcl-2.4.3

changes in sbcl-2.4.3 relative to sbcl-2.4.2:
  * enhancement: when dumping debug information to fasl files, the system
    respects the SOURCE_DATE_EPOCH environment variable (if set) as the latest
    timestamp to be used.
  * contributed module: the sb-perf contributed module, an interface
    originally by Luke Gorrie to Linux's perf, is now included by default on
    Linux.  (Thanks to Philipp Marek)
  * platform support:
    ** on Linux and BSD variants, timezone querying is now faster.
    ** Arm64/Darwin: allow configuring the system with a relocatable static
       space.
    ** PPC64: allow configuring the system with fasteval.
  * bug fix: erroneous transform of EQUALP on characters (lp#2055425)
  * bug fix: float rounders (FTRUNCATE and related functions) handle minus
    zero more consistently, returning minus zero as the primary value when
    rounding to zero from a negative value.
  * bug fix: type checks for (VECTOR T) were giving the wrong answer for
    vectors displayed to simple multi-dimensional arrays.  (reported by
    _death)
  * bug fix: do not transform away division by BIT when the BIT might still
    include 0.  (lp#2056184, reported by xizang)
  * bug fix: various errors related to imperfections in the perfect hash
    generator.  (lp#2055794, lp#2056341)
  * bug fix: respect declarations for symbol macros inside defmethod.
    (lp#2056514, reported by Jonathan Braud)
  * bug fix: failure to set structure slots to floats on Arm64.  (lp#2058148,
    reported by Bibek Panthi)
  * optimization: improvements to the implementation of CASE.
  * optimization: faster PARSE-INTEGER :radix 10/16 on word-sized integers.
  * optimization: improvements to LOGBITP.
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