Ruby

win32.c: support known reparse points only

• win32/win32.c (winnt_lstat): check reparse point tags and treat
  supported tags only as symbolic links.
  [ruby-core:70454] [Bug #11462]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51640 b2dd03c8-39d4-4d8f-98ff-823fe69b080e