PR 1855/cpukit
* posix/src/psignal.c, posix/src/pthread.c, posix/src/pthreadjoin.c:
Correct signal processing during pthread_join. We are supposed to
unblock the thread waiting on a pthread_join(), dispatch the signal
handler, account for it potentially overwriting errno, and then have
the thread return to blocking within pthread_join().
f05af6b733