Remove no longer used libcanberra-gtk3.vapi (#254)

Author: ryonakano

meson.build

@@ -8,7 +8,6 @@ gnome = import('gnome')
 i18n = import('i18n')
 
 add_global_arguments('-DGETTEXT_PACKAGE="@0@"'.format (meson.project_name()), language:'c')
-add_project_arguments(['--vapidir', join_paths(meson.current_source_dir(), 'vapi')], language: 'vala')
 
 css_gresource = gnome.compile_resources(
     'css-resource',