gplugin/gplugin

Fix an issue where meson would fail if building without gtk3 support

2021-04-28, Gary Kramlich
b7c659d32d7a
Fix an issue where meson would fail if building without gtk3 support

Testing Done:
Ran `meson` (with no options) and verified that `ninja doc` built both `gplugin-doc` and `gplugin-gtk-doc`.

Ran `meson -Dgtk3=false` and verified that `ninja doc` just built `gplugin-doc`

Reviewed at https://reviews.imfreedom.org/r/629/
syntax: glob
.*.swp
*.debhelper
*.orig
*.pyc
*.ui~
\#*.ui\#
syntax: regexp
^build.*\/
^packaging\/debian\/tmp\/
^packaging\/debian\/(.+\.)?(substvars|debhelper\.log)$
^packaging\/debian\/build.*\/
^packaging\/debian\/libgplugin0?(-.+)?\/
^packaging\/debian\/gir1.2-gplugin-0.0\/
^packaging\/debian\/files$
^po\/.*\.pot$
^obj-x86_64-linux-gnu\/
^debian\/?$