Update to 0.10.46 and only keep one libgoffice version

libgoffice 0.10 has been introduced long enough ago 6 years ago, stopping support
for libgoffice 0.8, it is now more than time, to remove libgoffice 0.8 and only
keep 0.10.

Remove the optionnal goffice option for projects not supporting 0.10.