Avoid race conditions when computing real frame positions on Haiku

Avoid race conditions when computing real frame positions on Haiku

* src/haiku_support.cc (DispatchMessage): Accept
SEND_MOVE_FRAME_EVENT.
(class EmacsWindow, FrameMoved): Include decorator frame in
MOVE_EVENT events.
(be_send_move_frame_event): New function.
* src/haiku_support.h (struct haiku_move_event): Include
decorator dimensions.  Update prototypes.

* src/haikufns.c (haiku_update_after_decoration_change): Ask for
a move frame event and don't do anything if configury is not yet
complete.

* src/haikuterm.c (haiku_read_socket): Adjust accordingly.