Bug#1001405: xnec2c: blocks UI on file system sync

[Benjamin Barenblat <bbaren@debian.org>]

Package: xnec2c
Version: 1:4.1.1-2
Tags: upstream
Control: found -1 1:4.2-1
Control: forwarded -1 https://github.com/KJ7LNW/xnec2c/issues/1

xnec2c blocks the UI on sync(2) every time it closes a FILE (see
https://sources.debian.org/src/xnec2c/1:4.2-1/src/utils.c/#L281). On
file systems where sync is slow (e.g., ZFS), this can translate to
multiple seconds of unresponsive UI at apparently random times during
program execution.

For the time being, I think Debian should probably just patch out the
sync call. It’s not necessary for the program to function, and most
people probably don’t expect their antenna simulator to be crash-safe.

Until this gets resolved, running xnec2c under eatmydata seems to work
fine.