[NTVDM]
Fix dead code.



git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@63308 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]
- Add some diagnostic DPRINTs (they are off by default), and fix few of them.
- Fix/complete few comments.
- Implement INT 21h, AH=56h (rename file), 5Ah (create temporary file), 5Bh (create new file), 68h and 6Ah ("commit" aka. flush file; they are the same function).
- Stubplement INT 21h, AH=60h (canonicalize file name or path) and 6Ch (extended open or create file). For this latest one I will merge DosCreateFile and DosOpenFile into the same function (in fact a wrapper around CreateFileA, that is used both for creating and opening files).

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@63309 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]
Partially implement INT 21h, AH=60h -- "Canonicalize File Name or Path".

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@63310 97493ccd-5924-5043-b1f5-66cb403b36ce
[NTVDM]
Implement INT 21h, AH=5Ch "Lock/Unlock Region of File".

git-svn-id: svn://svn.reactos.org/reactos/trunk/reactos@63311 97493ccd-5924-5043-b1f5-66cb403b36ce