merge revision(s) r44628: [Backport #9413]

	* eval.c (rb_mod_s_constants): return its own constants for other
	  than Module itself.  [ruby-core:59763] [Bug #9413]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45010 b2dd03c8-39d4-4d8f-98ff-823fe69b080e