Generate gtester-report from .in file

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: GNOME/glib#1544
Signed-off-by: Simon McVittie <smcv@collabora.com>
10 jobs for <span class="ref-name">1544-gtester-report</span> in 24 minutes and 57 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #111712
cross-android_api21_arm64

00:01:37

passed #111713
cross-android_api28_arm64

00:01:35

passed #111714
cross-mingw64

00:02:14

passed #111740
fedora-autotools-x86_64

00:05:45

passed #111710
fedora-x86_64

00:04:36

manual #111717
freebsd-11 allowed to fail manual
freebsd-11-x86_64
passed #111715
win32
msys2-mingw32

00:07:02

passed #111716
win32
vs2017-x64

00:06:53

failed #111711
fedora-autotools-x86_64

00:04:35

 
  Coverage
passed #111718
coverage

00:02:05

74.6%