libffi: update from 3.5.2 to 3.6.0

[bgilbert]

No description provided.

[bgilbert]

Usual failures, plus some new ones in new CI jobs.

Ubuntu ppc64le has long double problems, but Alpine ppc64le works and we appear to match upstream's long double detection:

679/724 complex - libffi:cls_complex_longdouble -O2        FAIL            0.25s   killed by signal 6 SIGABRT
680/724 complex - libffi:cls_complex_longdouble -O0        FAIL            0.27s   killed by signal 6 SIGABRT
682/724 complex - libffi:cls_complex_struct_longdouble -O2 FAIL            0.21s   killed by signal 6 SIGABRT
684/724 complex - libffi:cls_complex_struct_longdouble -O0 FAIL            0.24s   killed by signal 6 SIGABRT
693/724 complex - libffi:cls_complex_va_longdouble -O0     FAIL            0.18s   killed by signal 6 SIGABRT
697/724 complex - libffi:cls_complex_va_longdouble -O2     FAIL            0.21s   killed by signal 6 SIGABRT
699/724 complex - libffi:complex_longdouble -O0            FAIL            0.18s   killed by signal 6 SIGABRT
700/724 complex - libffi:complex_longdouble -O2            FAIL            0.20s   killed by signal 6 SIGABRT
705/724 complex - libffi:return_complex1_longdouble -O0    FAIL            0.20s   killed by signal 6 SIGABRT
706/724 complex - libffi:return_complex1_longdouble -O2    FAIL            0.19s   killed by signal 6 SIGABRT
711/724 complex - libffi:many_complex_longdouble -O2       FAIL            0.37s   killed by signal 6 SIGABRT
714/724 complex - libffi:many_complex_longdouble -O0       FAIL            0.41s   killed by signal 6 SIGABRT
717/724 complex - libffi:return_complex2_longdouble -O0    FAIL            0.18s   killed by signal 6 SIGABRT
722/724 complex - libffi:return_complex2_longdouble -O2    FAIL            0.21s   killed by signal 6 SIGABRT
723/724 complex - libffi:return_complex_longdouble -O2     FAIL            0.18s   killed by signal 6 SIGABRT
724/724 complex - libffi:return_complex_longdouble -O0     FAIL            0.19s   killed by signal 6 SIGABRT

clang-cl arm64:

lld-link: error: undefined symbol: ffi_prep_cif_machdep_var
lld-link: error: undefined symbol: ffi_prep_cif_machdep
lld-link: error: undefined symbol: ffi_prep_closure_loc
lld-link: error: undefined symbol: ffi_call

clang-cl x64:

334/334 closures - libffi:unwindtest_ffi_call         TIMEOUT        30.08s   exit status 1

msys clangarm64:

354/664 call - libffi:longjmp -O0                         FAIL            0.34s   (exit status 3221225727 or 0xc00000ff)
355/664 call - libffi:longjmp -O2                         FAIL            0.32s   (exit status 3221225727 or 0xc00000ff)
661/664 closures - libffi:unwindtest -O0                  FAIL            0.09s   (exit status 541541187 or 0x20474343)
662/664 closures - libffi:unwindtest -O2                  FAIL            0.09s   (exit status 541541187 or 0x20474343)
663/664 closures - libffi:unwindtest_ffi_call -O2         FAIL            0.09s   (exit status 541541187 or 0x20474343)
664/664 closures - libffi:unwindtest_ffi_call -O0         FAIL            0.12s   (exit status 541541187 or 0x20474343)

macOS arm64:

481/720 closures - libffi:closure_loc_fn0 -O0              FAIL            0.01s   killed by signal 6 SIGABRT
482/720 closures - libffi:closure_loc_fn0 -O2              FAIL            0.02s   killed by signal 6 SIGABRT