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260622.4 · deps: update libffi to 3.6.0

<(git log)

• ../
• asmcfi.m4
• ax_cc_maxopt.m4
• ax_cflags_warn_all.m4
• ax_check_compile_flag.m4
• ax_compiler_vendor.m4
• ax_configure_args.m4
• ax_enable_builddir.m4
• ax_gcc_archflag.m4
• ax_gcc_x86_cpuid.m4
• ax_prepend_flag.m4
• ax_require_defined.m4
• libtool.m4
• ltoptions.m4
• ltsugar.m4
• ltversion.m4
• lt~obsolete.m4