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        Reset object bits

        Entry:
          AH = 12h
          BH = 0Bh
          BL = object
               00h handle is DWORD on top of stack
                   Window:  write attributes only
                   Mailbox: send message by reference
                   Pointer: reset control flags
               01h write attributes only to task's default window
               02h send msg/status by reference to mailbox
                   (task's handle on stack)
               03h send msg/status by reference to current task's mailbox
               04h clear control flags on KEYBOARD object
                   (handle on top of stack)
               05h clear control flags on task's default KEYBOARD object
               06h remove specific object from OBJECTQ
                   (task's handle on stack)
               07h remove specific object from task's default OBJECTQ
          STACK: (if mailbox) DWORD status
                              DWORD length
                              DWORD address
                 (if window)  DWORD number of attributes to write
                              DWORD address of attributes
                 (if objectq) DWORD handle of object to remove
                 (otherwise)  DWORD indicates which bits to clear