* remove trailing spaces.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44014 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
array.c: prefer lhs elements

* array.c (rb_ary_or): lhs elements are prefered, so should not
  replace with rhs elements.
* test/ruby/test_array.rb (test_OR_in_order): import the test failed
  by r43969 from rubyspec/core/array/union_spec.rb.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44015 b2dd03c8-39d4-4d8f-98ff-823fe69b080e