changes in sbcl-2.4.5 relative to sbcl-2.4.4:

  * incompatible change: attempting to pass or return alien structs by value
    now signals errors.  Previously, such attempts would silently tend to
    corrupt registers or memory; there is work in progress to allow such calls
    conforming to the platform ABI.  (thanks to Rongcui Dong)
  * minor incompatible change: function debug info is compressed only if the
    system is compiled with libzstd, rather than falling back to a pure-lisp
    compression implementation.
  * minor incompatible change: the compiler will warn in more cases when it
    can detect incorrectly-typed arguments to FORMAT directives ~C and ~R
  * minor incompatible change: strings are converted to a more compact
    representation if possible before being used as docstrings.
  * platform support:
    ** explicitly include stdlib.h where needed on OpenBSD.  (thanks to
       Sebastien Marie)
    ** make the editcore utility work on Windows.  (thanks to Luís Borges de
       Oliveira)
    ** fix memory initialization in RUN-PROGRAM on Windows.
    ** resolve a deadlock in %INTERRUPT-THREAD on Darwin.  (lp#2062940,
       reported by Yan)
    ** hang on startup under some terminal emulators on OS X 14.5.
       (lp#2067313, reported by Richard M Kreuter)
  * enhancement: when (> debug 1), try to find source locations for code
    expanded from macros that copy their input forms.
  * bug fix: the method-combination generic function caches were missing some
    of the generic functions constructed during the PCL build itself.
    (reported by Didier Verna)
  * bug fix: SXHASH on equal PATHNAME objects could return different values in
    different cores.  (reported by Luís Borges de Oliveira)
  * bug fix: spurious compiler warnings on SORT in some circumstances.
    (lp#2065609, reported by William G Lederer)
  * optimization: faster bignum addition and negation on arm64, x86-64.
  * optimization: faster type tests for (unsigned-byte X) for X being
    multiples of the platform word size, on arm64, x86-64.
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