gtk-doc doesn't know what "unsigned" is
When parsing headers and structs, gtk-doc chokes on fields which have the type
unsigned, short for
2018-11-09 14:05:59,786:common.py:ParseStructDeclaration:352:WARNING:Cannot parse struct field: ""
The work-around is to use
unsigned int, but that probably shouldn't be needed.
I was fairly certain this bug was already filed, but I couldn't find it again in GitLab.