* Null stream implementation

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25495 3ad0048d-3df7-0310-abae-a5850022a9f2
* Added Read/Write of int64

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25496 3ad0048d-3df7-0310-abae-a5850022a9f2