README: mention about README.win32.
win32/README.win32: small changes.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37869 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
README: mention about README.win32.
win32/README.win32: small changes.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37869 b2dd03c8-39d4-4d8f-98ff-823fe69b080e