The 4 second timeout of the invafd test case is not always enough when
running under qemu; increase it to 10 seconds.

check that poll on an invalid fd doesn't hang in the dual poll case

Add test case from PR lib/44552 by Alexander Nasonov. I also lobbed
in a test for select(0, NULL, NULL, NULL, &tv) in there.

add test for fix in rev 1.36 of librumphijack/hijack.c