[ros-diffs] [sginsberg] 37721: - guiddef.h: Don't define GUID_NULL as extern as the official header set doesn't do this. Also, it causes conflicts under some circumstances. - regstr.h: Add missing _IN_KERNEL_ guard - rpcndr.h: Don't use the DWORD type - windef.h: Add missing types, and put some under the BASETYPES guard - winnt.h: Don't define types which should be in windef.h - winuser.h: Correct KEYBOARD_OVERRUN_MAKE_CODE declaration, add missing NOWINDOWSTATION guard - ntgdityp.h: Fix header guard for "F