2.15.1 release
Fixes:
- A new "g_variant_store: assertion 'data != NULL' failed" warning added to
GLib 2.84.1 when processing modulemd YAML documents with /data/xmd field with
an empty flow map ({}) value was fixed.
- Building documentation now works with GLib 2.80.1 at the expense of missing
cross links from libmodulemd to GLib. If it still fails you, you can disable
building the documentation with "-Dwith_docs=false" meson option.
- A number of warnings printed by recent Meson was reduced.