Bump libffi pin to v3.8.0

[renovate]

This PR contains the following updates:

Package	Update	Change
libffi	minor	3.6.0 → 3.8.0

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Release Notes

libffi/libffi (libffi)

v3.8.0: libffi 3.8.0

Compare Source

New features

• FFI_TYPE_VECTOR (SIMD) type support with libffi-computed layout, for aarch64 and x86-64 (#​1000, closes #​773).
• ffi_call_plan_size — report the total memory a reusable call plan owns, for embedders that account for the memory held by long-lived plans.
• powerpc64 ELFv2 _Complex long double support for both IBM-128 (double-double) and IEEE-128 formats (#​1003, closes #​1001).

Fixes

• powerpc64 big-endian ELFv2 closures returning 5-, 6-, or 7-byte structs: missing return jump-table entries produced a wrong result and leaked a libffi code pointer.
• ia64 return-value jump-table desync after the FFI_TYPE_LAST bump, which corrupted small-struct and HFA returns.
• powerpc Darwin closure returns broken by #​951 (#​1002).
• i386 FreeBSD/OpenBSD small structs now returned in registers (1, 2, 4, or 8 bytes), matching the platform ABI and fixing a segfault on struct returns through ffi_call and closures.

Performance

• Cache the static trampoline "unsupported" verdict on hosts whose page size exceeds the trampoline table mapping, avoiding redundant re-initialization on every closure allocation (e.g. 64K-page aarch64).

v3.7.1: libffi 3.7.1

Compare Source

Fix aarch64 ffi_call memory corruption when passing many large
structs by value.
Fix i386 thiscall/fastcall closure stack cleanup for 64-bit
integer and struct arguments.
Fix aarch64 int128 argument split between x7 and the stack on
Darwin (#​993).
Fix aarch64 clang-cl link failure for HFA helper functions (#​996).
Build a generic ffi_call_plan fallback on Windows x86-64.
Add Windows ARM64 (MSVC) build and continuous integration support.

v3.7.0: libffi 3.7.0

Compare Source

Add reusable call plans (ffi_call_plan_alloc/ffi_call_plan_invoke/ffi_call_plan_free).
Fix PA-RISC build broken by the conditional __int128 support added in 3.6.0.
Fix PA-RISC stack overflow passing many small structs by value.
Fix powerpc aix/darwin closure build errors (#​987).
Include .note.GNU-stack on FreeBSD/x86 (#​991).
Fix MSVC Win32 spin-lock atomics in bundled dlmalloc (#​989).
Harden static trampoline and x86_64 closure internals.
Fix ffi_call clobbering the caller's argument pointer array
when passing large structs by value.
Allow a NULL rvalue in ffi_call to discard the return value.
Fix wasm widening of integral returns narrower than ffi_arg.

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File name: MagPython/libffi-version

Post-upgrade command 'MagPython/update-libffi.sh 3.8.0' has not been added to the allowed list in allowedCommands