vm_eval.c: suppress warning

* vm_eval.c (eval_string_with_cref): move absolute_path inside
  non-exception block, since it is used only there.  [Bug #8436]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41315 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-06-16

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41316 b2dd03c8-39d4-4d8f-98ff-823fe69b080e