Philip Withnall 8629024243 tests: Skip appinfo/associations test if update-*-database not installed
If `update-desktop-database` or `update-mime-database` are not
installed, there are a few `GAppInfo` methods for modifying file
associations which will print a `g_warning()` when called. Something
like:
```
GLib-GIO-FATAL-WARNING: Failed to execute child process ‘update-desktop-database’ (No such file or directory)
```

(Example: https://gitlab.gnome.org/zamaudio/glib/-/jobs/3190053)

This will cause the appinfo/associations test to fail, as warnings are
fatal.

If that’s going to happen, skip the test. We can’t hard-depend on these
tools as they are external to GLib and only needed for a few operations.
Instead we have a soft runtime dependency on them; that should be
reflected in the tests.

Signed-off-by: Philip Withnall <philip@tecnocode.co.uk>

Helps: #3148
2023-10-22 23:34:00 +01:00
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