ddk/mountmgr.h (MOUNTMGR_IS_DRIVE_LETTER): remove stray '\' (r/os svn r61420.)

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6452 4407c894-4637-0410-b4f5-ada5f102cad1
ddk/ntifs.h: Fix some FSCTL_* constants (from r/os svn r61567.)

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6454 4407c894-4637-0410-b4f5-ada5f102cad1
ddk/ndis.h (NDIS51_MINIPORT_CHARACTERISTICS): add missing reserved fields (r/os svn r61688.)

git-svn-id: svn+ssh://svn.code.sf.net/p/mingw-w64/code/trunk@6457 4407c894-4637-0410-b4f5-ada5f102cad1