Right now, we get the following warnings when building the docs:
> gtk-doc.xsl: For acronym (nullable) no value found
This is because we're not adding the generated annotation glossary to
the docs sgml (presumably because we didn't need it as we didn't use
GObject-Introspection yet). This commit adds those lines and thus fixes
the warnings.
and make them build again without any wrong symbols.
This does not enable the devel-docs build yet, I'll fix
module by module before enabling the build again.
