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Author: Andreas Henriksson <email@example.com>
Date: Fri Aug 31 16:07:32 2018 +0200
Properly escape libexecdir path configure argument
This puts iwd binary in /usr/lib/<arch-triplet>/iwd/iwd.
Before it ended up in /lib/<arch-triplet>/iwd/iwd because
of the missing escape of the $prefix variable in the
Spotted (and fix suggested) by Michael Biebl,
who also suggested maybe it's better to just use /usr/libexec
(which is the default).