Ruby

file.c: simplify eaccess(3) callers

This will make future work to release GVL here simpler.

• file.c (rb_eaccess): new function
  (rb_file_readable_p): use rb_eaccess
  (rb_file_writable_p): ditto
  (rb_file_executable_p): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60895 b2dd03c8-39d4-4d8f-98ff-823fe69b080e