Add rules for packaging up Ruby code.

These were originally written by Parker and then cleaned up by me.

Change-Id: I93b66c83f80ca86a267abb84cab5f160b837083b
diff --git a/build_tests/ruby_to_require.rb b/build_tests/ruby_to_require.rb
new file mode 100644
index 0000000..b63cda2
--- /dev/null
+++ b/build_tests/ruby_to_require.rb
@@ -0,0 +1,4 @@
+# This file is loaded by ruby.rb through several mechanisms to make sure they
+# all work.
+
+$loaded = true