bug#61670: [PATCH] Improve test for blocked signals

Thanks, I installed that patch into Automake.

[bug#61670] [PATCH] Improve test for blocked signals

This fixes ERRORs reported by: * t/parallel-tests-interrupt.tap * t/self-check-exit.tap * t/self-check-is-blocked-signal.tap * t/tap-signal.tap * t/ax/am-test-lib.sh (is_blocked_signal): Revise Perl code to more closely follow documented interfaces where