[fpc-pascal] PostMessage() from a thread (in a thread save manner)

[dmitry boyarintsev]

Your code is safe for multiple threads to post to the queue.

But you also must make sure, that Processing a messsage from queue, would
not break Posting safetiness. The easiest way, is to wrap message extraction
into the same fpgApplication.Lock

You must also make sure, that no thread can try to post message, after
fpgApplicaiton is released. And it's quite possible situation, that causes
"strange errors" on application finalization.
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