Log Message:
libffi: updated to 3.4.2

3.4.2 Jun-28-21
    Add static trampoline support for Linux on x86_64 and ARM64.
    Add support for Alibaba's CSKY architecture.
    Add support for Kalray's KVX architecture.
    Add support for Intel Control-flow Enforcement Technology (CET).
    Add support for ARM Pointer Authentication (PA).
    Fix 32-bit PPC regression.
    Fix MIPS soft-float problem.
    Enable tmpdir override with the $LIBFFI_TMPDIR environment variable.
    Enable compatibility with MSVC runtime stack checking.
    Reject float and small integer argument in ffi_prep_cif_var().
      Callers must promote these types themselves.