dir.c: reduce syscalls
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59481 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dir.c: reduce syscalls
pattern, to reduce stat/lstat syscalls in subsequent
glob_helper.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59481 b2dd03c8-39d4-4d8f-98ff-823fe69b080e