tap/awk: handle exit statuses > 256 (seen on few korn shells) Some Korn shells, when a child process die due to signal number n, can leave in $? an exit status of 256+n instead of the more standard 128+n. Apparently, both behaviours are allowed by POSIX, so be prepared to handle them both. This change has been motivated by a testsuite failure on Debian with the AT&T Korn Shell version 93u-1. * lib/tap-driver.sh (get_test_exit_message): Handle the described Korn Shell behaviour too. ($scriptversion): Update.