Fix undefined behaviour in pulseaudio --start.

Don't call pthread_join() to join a thread from a different
process than the thread was created in. Doing so can lead to
undefined behaviour.

On OpenBSD, the symptom was a pulseaudio process with a single
thread waiting forever for other threads to join. Since that
process also held the autospawn lock, starting new pulseaudio
processes with --start kept failing. The problem was analyzed
with help from Philip Guenther.

This patch adds a pa_thread_free_nojoin() function which can
be used to free resources for a thread without a join, as
suggested by Tanu Kaskinen.

See https://bugs.freedesktop.org/show_bug.cgi?id=71738

src/pulsecore/thread-posix.c

@@ -127,6 +127,13 @@ void pa_thread_free(pa_thread *t) {
     pa_xfree(t);
 }
 
+void pa_thread_free_nojoin(pa_thread *t) {
+    pa_assert(t);
+
+    pa_xfree(t->name);
+    pa_xfree(t);
+}
+
 int pa_thread_join(pa_thread *t) {
     pa_assert(t);
     pa_assert(t->thread_func);