[USETUP]
Reimplement SetupCreateDirectory in such a way, that a full directory path will be created, if needed. This enables us to install ReactOS in a sub-directory like for example '\OS\Test\Alpha\ReactOS'.

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@63715 97493ccd-5924-5043-b1f5-66cb403b36ce