Bump ffi from 1.10.0 to 1.11.0

[dependabot-preview]

Bumps ffi from 1.10.0 to 1.11.0.

Changelog

Sourced from ffi's changelog.

1.11.0 / 2019-05-17

Added:

• Add ability to disable or force use of system libffi. #669
  Use like gem inst ffi -- --enable-system-libffi .
• Add ability to call FFI callbacks from outside of FFI call frame. #584
• Add proper documentation to FFI::Generator and ::Task
• Add gemspec metadata. #696, #698

Changed:

• Fix stdcall on Win32. #649, #669
• Fix load paths for FFI::Generator::Task
• Fix FFI::Pointer#read_string(0) to return a binary String. #692
• Fix benchmark suite so that it runs on ruby-2.x
• Move FFI::Platform::CPU from C to Ruby. #663
• Move FFI::StructByReference to Ruby. #681
• Move FFI::DataConverter to Ruby (#661)
• Various cleanups and improvements of specs and benchmarks

Removed:

• Remove ruby-1.8 and 1.9 compatibility code. #683
• Remove unused spec files. #684

Commits

• 9b4a9e4 Add version 1.11.0 to CHANGELOG
• 36f1bb5 Bump VERSION to 1.11.0
• 29c07a9 Pass options from rake task to the FFI::Generator
• 7efdd2e Include the name of the template file instead of just rake
• bc99b7e Add proper documentation to FFI::Generator and ::Task
• 17e13e2 Fix load paths for FFI::Generator::Task
• 423082a Add require call necessary to load from ffi/tools directory to example
• b144bce Fix example for FFI::StructGenerator
• 72b75af Merge pull request #698 from olleolleolle/patch-2
• 1bda3ef Merge pull request #695 from eregon/more-specs
• Additional commits viewable in compare view

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