Merge pull request #376 from rspec/ffi_ruby_1_9

Deal with new ffi Ruby version requirement

Author: JonRowe

Gemfile

@@ -24,6 +24,8 @@ if RUBY_VERSION < '2.0.0' && !!(RbConfig::CONFIG['host_os'] =~ /cygwin|mswin|min
   gem 'ffi', '< 1.9.15' # allow ffi to be installed on older rubies on windows
 elsif RUBY_VERSION < '1.9'
   gem 'ffi', '< 1.9.19' # ffi dropped Ruby 1.8 support in 1.9.19
+elsif RUBY_VERSION < '2.0'
+  gem 'ffi', '< 1.11.0' # ffi dropped Ruby 1.9 support in 1.11.0
 else
   gem 'ffi', '~> 1.9.25'
 end