A part is for only 1 version of Ruby so no need for version-specific paths

No more hardcoded/meaningless/old version number in the path.

rubygems.py

@@ -154,12 +154,12 @@ class Recipe(object):
             'RUBYLIB': os.environ.get('RUBYLIB', ''),
         }
         env = {
-            'GEM_HOME': '%(PREFIX)s/lib/ruby/gems/1.8' % s,
+            'GEM_HOME': '%(PREFIX)s/lib/ruby/gems' % s,
             'RUBYLIB': self._join_paths(
                 '%(RUBYLIB)s',
                 '%(PREFIX)s/lib',
                 '%(PREFIX)s/lib/ruby',
-                '%(PREFIX)s/lib/site_ruby/1.8',
+                '%(PREFIX)s/lib/site_ruby',
             ) % s,
             'PATH': self._join_paths(
                 '%(PATH)s',