meson: Bump minimal GLib version to 2.44
This means we can use some newer features and get rid of some boilerplate code using the G_DECLARE_* macros.
As discussed on IRC, 2.44 is old enough by now to start depending on it.
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This means we can use some newer features and get rid of some boilerplate code using the G_DECLARE_* macros.
As discussed on IRC, 2.44 is old enough by now to start depending on it.