Bump ffi from 1.9.18 to 1.11.1

Bumps ffi from 1.9.18 to 1.11.1.

Changelog

*Sourced from [ffi's changelog](https://github.com/ffi/ffi/blob/master/CHANGELOG.md).* > 1.11.1 / 2019-05-20 > ------------------- > > Changed: > * Raise required ruby version to >=2.0. [#699](https://github-redirect.dependabot.com/ffi/ffi/issues/699), [#700](https://github-redirect.dependabot.com/ffi/ffi/issues/700) > * Fix a possible linker error on ruby < 2.3 on Linux. > > > 1.11.0 / 2019-05-17 > ------------------- > This version was yanked on 2019-05-20 to fix an install issue on ruby-1.9.3. [#700](https://github-redirect.dependabot.com/ffi/ffi/issues/700) > > Added: > * Add ability to disable or force use of system libffi. [#669](https://github-redirect.dependabot.com/ffi/ffi/issues/669) > Use like `gem inst ffi -- --enable-system-libffi` . > * Add ability to call FFI callbacks from outside of FFI call frame. [#584](https://github-redirect.dependabot.com/ffi/ffi/issues/584) > * Add proper documentation to FFI::Generator and ::Task > * Add gemspec metadata. [#696](https://github-redirect.dependabot.com/ffi/ffi/issues/696), [#698](https://github-redirect.dependabot.com/ffi/ffi/issues/698) > > Changed: > * Fix stdcall on Win32. [#649](https://github-redirect.dependabot.com/ffi/ffi/issues/649), [#669](https://github-redirect.dependabot.com/ffi/ffi/issues/669) > * Fix load paths for FFI::Generator::Task > * Fix FFI::Pointer#read_string(0) to return a binary String. [#692](https://github-redirect.dependabot.com/ffi/ffi/issues/692) > * Fix benchmark suite so that it runs on ruby-2.x > * Move FFI::Platform::CPU from C to Ruby. [#663](https://github-redirect.dependabot.com/ffi/ffi/issues/663) > * Move FFI::StructByReference to Ruby. [#681](https://github-redirect.dependabot.com/ffi/ffi/issues/681) > * Move FFI::DataConverter to Ruby ([#661](https://github-redirect.dependabot.com/ffi/ffi/issues/661)) > * Various cleanups and improvements of specs and benchmarks > > Removed: > * Remove ruby-1.8 and 1.9 compatibility code. [#683](https://github-redirect.dependabot.com/ffi/ffi/issues/683) > * Remove unused spec files. [#684](https://github-redirect.dependabot.com/ffi/ffi/issues/684) > > > 1.10.0 / 2019-01-06 > ------------------- > > Added: > * Add /opt/local/lib/ to ffi's fallback library search path. [#638](https://github-redirect.dependabot.com/ffi/ffi/issues/638) > * Add binary gem support for ruby-2.6 on Windows > * Add FreeBSD on AArch64 and ARM support. [#644](https://github-redirect.dependabot.com/ffi/ffi/issues/644) > * Add FFI::LastError.winapi_error on Windows native or Cygwin. [#633](https://github-redirect.dependabot.com/ffi/ffi/issues/633) > > Changed: > * Update to rake-compiler-dock-0.7.0 > * Use 64-bit inodes on FreeBSD >= 12. [#644](https://github-redirect.dependabot.com/ffi/ffi/issues/644) > * Switch time_t and suseconds_t types to long on FreeBSD. [#627](https://github-redirect.dependabot.com/ffi/ffi/issues/627) > * Make register_t long_long on 64-bit FreeBSD. [#644](https://github-redirect.dependabot.com/ffi/ffi/issues/644) > * Fix Pointer#write_array_of_type [#637](https://github-redirect.dependabot.com/ffi/ffi/issues/637) > > ... (truncated)

Commits

- [`3d8c91c`](https://github.com/ffi/ffi/commit/3d8c91c902d67f2af184b1da1b0e99323bc1c744) Update CHANGELOG for ffi-1.11.1 - [`2a3d9d6`](https://github.com/ffi/ffi/commit/2a3d9d60db6d01e3a1472484371df2a14ec1ec3a) Bump VERSION to 1.11.1 - [`19d5776`](https://github.com/ffi/ffi/commit/19d5776080c2d8f3d2840ea449ef2c9a632b93d5) Add some missing items to CHANGELOG for ffi-1.11.0 - [`08b9b78`](https://github.com/ffi/ffi/commit/08b9b7875fe6fff8ba34d794a4bdebaf78b95ba2) Raise ruby version requirement to >=2.0 - [`e76c43b`](https://github.com/ffi/ffi/commit/e76c43b3efaa24563e6c93dd8f0128240197a88c) Fix build on ruby-2.0 on Linux - [`9b4a9e4`](https://github.com/ffi/ffi/commit/9b4a9e450a4f78bf569ad8b6497bd6b4e8ec82d3) Add version 1.11.0 to CHANGELOG - [`36f1bb5`](https://github.com/ffi/ffi/commit/36f1bb55aa0712fa8ea5431cfb9d94ebc2a34372) Bump VERSION to 1.11.0 - [`29c07a9`](https://github.com/ffi/ffi/commit/29c07a94fadfb644c28741f744ab9a3fda3e544c) Pass options from rake task to the FFI::Generator - [`7efdd2e`](https://github.com/ffi/ffi/commit/7efdd2ecbb8ab2df56aecade9c82fd48eb71969f) Include the name of the template file instead of just rake - [`bc99b7e`](https://github.com/ffi/ffi/commit/bc99b7efa78afc150fe32d09579a11c8990aaf84) Add proper documentation to FFI::Generator and ::Task - Additional commits viewable in [compare view](https://github.com/ffi/ffi/compare/1.9.18...1.11.1)

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Bump ffi from 1.9.18 to 1.11.1 #231