get-rusage-as, pthread_sigmask tests: Fix -fsanitize=thread findings. * lib/get-rusage-as.c (get_rusage_as): When compiled by "gcc -fsanitize=thread", don't try get_rusage_as_via_setrlimit. * tests/test-pthread_sigmask2.c (main): Clean up the killer_thread before exiting.

#!/bin/sh

tmpfile=
trap 'rm -fr $tmpfile' 1 2 3 15

tmpfile=test-fpending.t

./test-fpending${EXEEXT} > $tmpfile || exit 1

rm -fr $tmpfile

exit 0