Downgrade meson to 0.59.3 from 0.60.0
Lots on gnome packages failed to build in 3.15 because of deprecations in 0.59
Upstream issue https://github.com/mesonbuild/meson/issues/9441
- https://mesonbuild.com/Release-notes-for-0-59-0.html
- https://mesonbuild.com/Release-notes-for-0-60-0.html
For example https://mesonbuild.com/Reference-manual_builtin_meson.html#mesonsource_root
So build failed with data/meson.build:34:0: ERROR: Function does not take positional arguments. (mostly all gnome)
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