Fix implicit pthread_exit on main thread return
#1900
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According to pthread_exit man page, returning from a thread function implicitly calls pthread_exit only on non-main threads. This avoids a strange cast (with overflow check) at normal return from main.
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Closes #1767.
A normal return from
maindoes not constitute an implicitpthread_exitwhich would cast the return value tovoid*: #1767 (comment).