Bump ffi from 1.14.2 to 1.15.1

[dependabot-preview[bot]]

Bumps ffi from 1.14.2 to 1.15.1.

Changelog

Sourced from ffi's changelog.

1.15.1 / 2021-05-22

Fixed:

• Append -pthread to linker options. #893
• Use arm or aarch64 to identify Apple ARM CPU arch. #899
• Allow overriding gcc with the CC env var in const_generator.rb and struct_generator.rb. #897

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

Commits

• 513aef4 Bump VERSION to 1.15.1
• a0a457b Update CHANGELOG for ffi-1.15.1
• 54db5ef Append -pthread to linker options
• 4ad6fd5 Merge pull request #899 from andrewferk/apple-m1-arm-aarch64
• 3056009 Use arm or aarch64 to identify Apple ARM CPU arch
• 4430b6d Merge pull request #897 from leshik/fix-cc
• 928e3f9 Allow overriding gcc with the CC env var in const_generator.rb and `str...
• 2cc0e53 Relax bundler version for JRuby on Github Actions
• 9d7eeb7 Merge branch 'master' of github.com:ffi/ffi
• 85f7db9 Revert "Enable loading FFI gem on rubinius"
• Additional commits viewable in compare view

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