* gem_prelude.rb, lib/rubygems.rb (Gem.suffixes): return truely

require-able suffixes only.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@28919 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

gem_prelude.rb

@@ -34,6 +34,10 @@ if defined?(Gem) then
       :sitelibdir        => RbConfig::CONFIG["sitelibdir"],
     }
 
+    def self.suffixes
+      ['.rb', ".#{RbConfig::CONFIG["DLEXT"]}"]
+    end
+
     def self.dir
       @gem_home ||= nil
       set_home(ENV['GEM_HOME'] || default_dir) unless @gem_home