user: Fix WM_QUIT Message Ordering From PostQuitMessage

[Robert Shearman]

The special behaviour of PostQuitMessage is very well described here:
http://blogs.msdn.com/oldnewthing/archive/2005/11/04/489028.aspx

ChangeLog:
Added a new server call as PostQuitMessage should set a flag in the
message queue to return the WM_QUIT message when there are no other
pending messages, rather than posting a message to the thread queue as
it does at the moment.

  dlls/user/message.c            |   31 +++++++++++++++++++++++---
  dlls/user/tests/msg.c          |    4 ---
  include/wine/server_protocol.h |   15 ++++++++++++-
  server/protocol.def            |    4 +++
  server/queue.c                 |   47 
+++++++++++++++++++++++++++++++++++++++-
  server/request.h               |    2 ++
  server/trace.c                 |    8 +++++++
  7 files changed, 101 insertions(+), 10 deletions(-)

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