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Previously, it was installed unmodified by the Meson build system.

We don't need to define @bindir@, because gtester-report never
actually referred to it. We also don't need a definition of
GTESTER_REPORT for use by GLib itself, because its last use was removed
in 2013 (https://bugzilla.gnome.org/show_bug.cgi?id=709995).

Fixes: #1544Signed-off-by: Simon McVittie <smcv@collabora.com>