thread-join returns the result of finished thread
* doc/lispref/threads.texi (Basic Thread Functions): * etc/NEWS: Document return value of `thread-join'. * src/thread.c (invoke_thread_function, Fmake_thread) (init_main_thread): Set result. (Fthread_join): Propagate signals, and return result. (Vmain_thread): New defvar. * src/thread.h (struct thread_state): Add `result' field. * test/src/thread-tests.el (threads-join): Test also return value. (threads-join-error): New test. (threads-mutex-signal): Check for propagation of `quit' signal.
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