Bump ffi from 1.9.18 to 1.15.0

[dependabot[bot]]

Bumps ffi from 1.9.18 to 1.15.0.

Changelog

Sourced from ffi's changelog.

1.15.0 / 2021-03-05

Fixed:

• Fix MSVC build
• Fix async callbacks in conjunction with fork(). #884

Added:

• Allow to pass callbacks in varargs. #885
• Name the threads for FFI callback dispatcher and async thread calls for easier debugging. #883 The name can be retrieved by Thread.name and is shown by Thread.list.inspect etc. Even gdb shows the thread name on supported operating systems.
• Add types.conf for powerpc64le-linux
• Add types.conf for riscv64-linux
• More release automation of ffi gems

Changed:

• Switch from rubygems-tasks to bundler/gem_helper

Removed:

• Remove unused VariadicInvoker#init

1.14.2 / 2020-12-21

Fixed:

• Fix builtin libffi on newer Ubuntu caused by an outdated Makefile.in . #863

1.14.1 / 2020-12-19

Changed:

• Revert changes to FFI::Pointer#write_string made in ffi-1.14.0. It breaks compatibilty in a way that can cause hard to find errors. #857

1.14.0 / 2020-12-18

Added:

• Add types.conf for x86_64-msys, x86_64-haiku, aarch64-openbsd and aarch64-darwin (alias arm64-darwin)
• Add method AbstractMemory#size_limit? . #829
• Add new extconf option --enable-libffi-alloc which is enabled per default on Apple M1 (arm64-darwin).

Changed:

• Do NULL pointer check only when array length > 0 . #305
• Raise an error on an unknown order argument. #830
• Change FFI::Pointer#write_string to terminate with a NUL byte like other string methods. #805

... (truncated)

Commits

• 1fb309c Use platform name as used by rubygems
• 05537c7 Merge pull request #888 from larskanis/async-callback-with-fork
• df39cc6 Fix async callbacks in conjunction with fork()
• ea13267 Prepare ffi-1.15.0
• 1a87af0 Replace rubygems-tasks by bundler and do more release automation
• 334c3af Use shorter thread names for FFI's callbacks
• 1cce06d Merge branch 'name-dispatcher-thread' of https://github.com/DataDog/ffi into ...
• c48dfe7 Implement async callback test on Windows and improve async specs
• 6d14c0a Separate double callback spec and variadic call with function pointer
• 57bcc60 Remove unused VariadicInvoker#init
• Additional commits viewable in compare view

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