win32.h: revert r37337
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38992 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32.h: revert r37337
instead of fstati64() on mingw32. [Bug #7276]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38992 b2dd03c8-39d4-4d8f-98ff-823fe69b080e