Merge branch 'pr/2829'
- pr/2829: (PUP-391) Ruby 2 exception type changed to EISDIR (PUP-391) Fix Rdoc 4+ specs on Windows Ruby 2 x64 (PUP-391) Use FFI.errno instead of GetLastError (PUP-391) Remove unused file19windows.rb variable (PUP-391) Fix INVALID_FILE_ATTRIBUTES on x64