[ruby/io-console] Move FFI console under lib

Having the separate dir makes testing difficult and doesn't
reflect the structure the gem will eventually have. We can filter
these files out if necessary when building the CRuby gem.

ruby/io-console@881010447c

ext/io/console/io-console.gemspec

@@ -25,15 +25,15 @@ Gem::Specification.new do |s|
   if Gem::Platform === s.platform and s.platform =~ 'java'
     s.files.delete_if {|f| f.start_with?("ext/")}
     s.extensions.clear
-    s.require_paths.unshift("jruby")
     s.files.concat(%w[
-      jruby/io/console.rb
-      jruby/io/console/bsd_console.rb
-      jruby/io/console/common.rb
-      jruby/io/console/linux_console.rb
-      jruby/io/console/native_console.rb
-      jruby/io/console/stty_console.rb
-      jruby/io/console/stub_console.rb
+      lib/io/console.rb
+      lib/io/console/ffi/bsd_console.rb
+      lib/io/console/ffi/common.rb
+      lib/io/console/ffi/console.rb
+      lib/io/console/ffi/linux_console.rb
+      lib/io/console/ffi/native_console.rb
+      lib/io/console/ffi/stty_console.rb
+      lib/io/console/ffi/stub_console.rb
     ])
   end