Tests run under systemd (and similar) have SIGPIPE blocked by
default. This was causing this SIGPIPE test to get stuck when
run by automated builders used by Nix. Thanks to Julien
Moutinho and Dominique Martinet for tracking down this failure.
Reported-by: Julien Moutinho <julm+public-inbox@sourcephile.fr>
Reported-by: Dominique Martinet <asmadeus@codewreck.org>
Link: https://public-inbox.org/meta/20220227080422.gyqowrxomzu6gyin@sourcephile.fr/