Because we're using plain buildtype these have to be
passed manually.
See: https://gitlab.gnome.org/GNOME/gtk/blob/3.24.10/meson.build#L59
With autotools the mapping for the the options to the defines was:
yes: G_ENABLE_DEBUG G_ENABLE_CONSISTENCY_CHECKS
minimum: G_ENABLE_DEBUG G_DISABLE_CAST_CHECKS
no: G_DISABLE_CAST_CHECKS G_DISABLE_ASSERT G_DISABLE_CHECKS
So we're passing the exact ones that would've been used for minimum.
Additionally it isn't a good idea to pass the equivalents used for "no"
as it eliminates G_ENABLE_DEBUG which disables pre-condition checks and
assertions. The actual option only existed to serve people who needed a
specific build of GTK for very specific environments. And now they are
much better served with meson's plain buildtype and figuring out what to
pass themselves.
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