45452: builtins: kill: Add `kill ''` regression test with explicit sigspec

The version without a sigspec can't be added yet because it would still
kill the test runner even in expected-to-fail mode; see workers/45449
for discussion. For the same reason, we use a signal which is non-fatal
by default and unlikely to be sent by someone else, SIGURG, to do the
expected-to-fail case prior to the fix.

0 files changed, 0 insertions, 0 deletions