[ole32] Bugfix for implicit MTA apartment initialization

[Rosen Diankov]

There are cases where the "called from wrong apartment" gets called in
ole32/rpc.c:ClientRpcChannelBuffer_SendReceive and there is no COM apartment
set.

Actually the thread should be using the implicit multithreaded apartment
created from a previous thread's Co­InitializeEx call

http://blogs.msdn.com/b/oldnewthing/archive/2013/04/19/10412399.aspx

Therefore the fix is really simple, add this check right in the beginning of
ClientRpcChannelBuffer_SendReceive

first reported in this bug:

http://bugs.winehq.org/show_bug.cgi?id=33749

rosen diankov,
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