gplugin/gplugin

Fix the build when ran in a meson subproject.
feature/meson-subproject-fix
2019-08-12, Gary Kramlich
923cbd2a8055
Fix the build when ran in a meson subproject.

We were using meson.build_root() when we should have been using
meson.current_build_dir().
if get_option('nls')
i18n.gettext(GETTEXT_PACKAGE)
endif