Log Message:
geography/gpsd: Catch up with ruby version changes

The pathname of asciidoctor changes when pkgsrc changes the default
ruby version.  Upstream gpsd has code to look for asciidoctorNN for
several NN, but not 31.  However, pkg_alternatives provides
asciidoctor which is found, making this not noticeable when building
on normal systems -- but of course bulk builds failed.