dir.c: fix up r59481 for old kernels
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59527 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dir.c: fix up r59481 for old kernels
provide d_type member but just always set DT_UNKNOWN for any
entries. [ruby-core:82266] [Bug #13785]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59527 b2dd03c8-39d4-4d8f-98ff-823fe69b080e