Bump ffi from 1.9.18 to 1.15.3

[dependabot[bot]]

Bumps ffi from 1.9.18 to 1.15.3.

Changelog

Sourced from ffi's changelog.

1.15.3 / 2021-06-16

Fixed:

• Fix temporary packaging issue with libffi. #904

1.15.2 / 2021-06-16

Added:

• Add support for Windows MINGW-UCRT build. #903
• Add /opt/homebrew/lib/ to fallback search paths to improve homebrew support. #880 #882

Changed:

• Regenerate types.conf for FreeBSD12 aarch64. #902

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

... (truncated)

Commits

• 931efbe Bump VERSION to 1.15.3
• 6fc849f Add CHANGELOG entry for ffi-1.15.2
• 36cee2c Bump VERSION to 1.15.2
• 4924308 Fix Windows libc detection for MSYS2-ucrt build (#903)
• 036a1a3 Merge pull request #902 from MikaelUrankar/master
• 264c3f7 Regen types.conf for FreeBSD12 aarch64
• 393a833 Switch time_t and suseconds_t types to long on FreeBSD aarch64
• 82e2092 Merge pull request #882 from OleMchls/patch-1
• 513aef4 Bump VERSION to 1.15.1
• a0a457b Update CHANGELOG for ffi-1.15.1
• Additional commits viewable in compare view

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