changes in sbcl-2.3.4 relative to sbcl-2.3.3:

  * enhancement: attempts to call non-callable objects can now provide
    USE-VALUE restarts on x86-64 and arm64.
  * bug fix: ioctl() (both in SBCL's internals and through SB-POSIX) was
    broken on ARM64/Darwin.  (reported by fiddlerwoaroof)
  * platform support:
    ** support for cross-compiling the system to Android has been added;
       (thanks to Gleefre)
    ** include likely absolute paths for gmp and mpfr on ARM64/Darwin; (thanks
       to Elias Lawson-Fox)
    ** include another absolute path for mpfr on Windows; (thanks to Ari
       Projansky)
    ** the PROMISE-COMPILE feature from the SB-CONCURRENCY contrib is now
       available on all threaded platforms;
  * optimization: VALUES-LIST performs less redundant work on x86-64 and
    ARM64.
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