* Use g_signal_new_class_handler to handle the accumulator based signals
* Remove the optional struct offset for the non accumulator based signals
* This all fixes the warnings from vapigen as well
Testing Done:
Ran the unit tests, gplugin-query, and gplugin-gtk3-viewer without issue.
Reviewed at https://reviews.imfreedom.org/r/1028/
ifget_option('gtk4')
ifnotget_option('install-gplugin-gtk4-viewer')
summary('gplugin-gtk4-viewer',
'You have disabled installation of gplugin-gtk4-viewer which is a '+