[ros-svn] [ion] 17650: - Fix kernel32 and ntoskrnl build issues.

[ion at svn.reactos.com]

- Fix kernel32 and ntoskrnl build issues.
- Define public version of DEVOBJ_EXTENSION in DDK.


Updated files:
trunk/reactos/lib/kernel32/file/mailslot.c
trunk/reactos/ntoskrnl/io/device.c
trunk/reactos/ntoskrnl/io/deviface.c
trunk/reactos/ntoskrnl/io/file.c
trunk/reactos/ntoskrnl/io/plugplay.c
trunk/reactos/ntoskrnl/io/pnpmgr.c
trunk/reactos/w32api/include/ddk/winddk.h
trunk/reactos/w32api/include/ntdef.h