use require_relative
use require_relative

* spec/ruby/core/file/ftype_spec.rb: use require_relative which
  resolves symbolic links consistently to git rid of constant
  re-definition warnings.

git-svn-id: ab86ecd26fe50a6a239cacb71380e346f71cee7d@63046 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ruby/spec,eregon/rubyspec,ruby/rubyspec,ruby/spec,eregon/rubyspec,eregon/rubyspec,ruby/rubyspec,ruby/spec,nobu/rubyspec,nobu/rubyspec,nobu/rubyspec