main/libffi: upgrade to 3.4.2

https://sourceware.org/pipermail/libffi-announce/2021/000014.html

 usr/lib/
-usr/lib/libffi.so.7
-usr/lib/libffi.so.7.1.0
+usr/lib/libffi.so.8
+usr/lib/libffi.so.8.1.0

This MR contains only main rebuilds, community !24904 (merged) and testing !24905 (merged)

If ghc will fail there's !25100 (closed)

affected packages

main/glib: rebuild against libffi.so.8
main/gobject-introspection: rebuild against libffi.so.8
main/guile: rebuild against libffi.so.8
main/hylafaxplus: rebuild against libffi.so.8
main/llvm10: rebuild against libffi.so.8
main/llvm11: rebuild against libffi.so.8
main/p11-kit: rebuild against libffi.so.8
main/py3-bcrypt: rebuild against libffi.so.8
main/py3-cffi: rebuild against libffi.so.8
main/py3-cryptography: rebuild against libffi.so.8
main/py3-gobject3: rebuild against libffi.so.8
main/py3-pynacl: rebuild against libffi.so.8
main/python3: rebuild against libffi.so.8
main/ruby: rebuild against libffi.so.8
main/wayland: rebuild against libffi.so.8
community/cabal: rebuild against libffi.so.8
community/ecl: rebuild against libffi.so.8
community/firefox-esr: rebuild against libffi.so.8
community/firefox: rebuild against libffi.so.8
community/ghc: rebuild against libffi.so.8
community/ghc: rebuild against libffi.so.8
community/ghc: rebuild against libffi.so.8
community/ghc: rebuild against libffi.so.8
community/ghc: rebuild against libffi.so.8
community/java-jna: rebuild against libffi.so.8
community/lldb: rebuild against libffi.so.8
community/lua-lgi: rebuild against libffi.so.8
community/maturin: rebuild against libffi.so.8
community/moarvm: rebuild against libffi.so.8
community/mozjs78: rebuild against libffi.so.8
community/nqp: rebuild against libffi.so.8
community/openjdk10: rebuild against libffi.so.8
community/openjdk11: rebuild against libffi.so.8
community/openjdk9: rebuild against libffi.so.8
community/py3-argon2-cffi: rebuild against libffi.so.8
community/py3-josepy: rebuild against libffi.so.8
community/py3-opencl: rebuild against libffi.so.8
community/python2: rebuild against libffi.so.8
community/python3-tkinter: rebuild against libffi.so.8
community/rakudo: rebuild against libffi.so.8
community/ruby-ffi: rebuild against libffi.so.8
community/sbcl: rebuild against libffi.so.8
testing/gforth: rebuild against libffi.so.8
testing/idris: rebuild against libffi.so.8
testing/micropython: rebuild against libffi.so.8
testing/ngs: rebuild against libffi.so.8
testing/nyxt: rebuild against libffi.so.8
testing/openjdk12: rebuild against libffi.so.8
testing/openjdk13: rebuild against libffi.so.8
testing/openjdk14: rebuild against libffi.so.8
testing/openjdk15: rebuild against libffi.so.8
testing/openjdk16: rebuild against libffi.so.8
testing/openmp: rebuild against libffi.so.8
testing/polyml: rebuild against libffi.so.8
testing/pypy: rebuild against libffi.so.8
testing/racket: rebuild against libffi.so.8
testing/ruby-build: rebuild against libffi.so.8
testing/thunderbird: rebuild against libffi.so.8