appdata: Remove dynamic build-date
This removes a source of build-time non-determinism, improving the
build reproducibility of gnome-maps
.
The approach taken here follows a similar changeset in gtk!4077 (merged).
Resolves #729 (closed).
I have confirmed that the project builds successfully (using meson build
and subsequently ninja
from the build
dir), but have not performed further testing beyond that.
cc @bmwiedemann