Try both libpthread and RTLD_DEFAULT when looking up functions
so the test can find everything after the libpthread->libc move

Test that various calls can be interrupted in a non-threaded process,
then dlopen() libpthread and do that again in a second thread,
and then verify that they're all correctly acting as cancellation

Test that various calls can be interrupted in a non-threaded process,
then dlopen() libpthread and do that again in a second thread,
and then verify that they're all correctly acting as cancellation points.

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