[gtk/release-script: 1/2] build: Move the gtk-doc dep to the toplevel

[Matthias Clasen <matthiasc src gnome org>]

commit a8eae7afaa8560b8aa949b2de14f4da0027af42b
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 4 09:52:37 2020 -0400

    build: Move the gtk-doc dep to the toplevel
    
    We want to include the gtk-doc subproject in release
    tarballs, using --include-subprojects, but that only
    works if we've actually built the subproject. And
    enabling gtk-doc for dist builds is problematic -
    it tends to break meson dist.
    
    So declare the gtk-doc dependency independent of
    -Dgtk_doc, and use --force-fallback-for for it.

 docs/reference/meson.build | 6 ------
 meson.build                | 5 +++++
 2 files changed, 5 insertions(+), 6 deletions(-)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index 905af97d00..76525011ba 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -3,12 +3,6 @@ if get_option('gtk_doc')
     error('Building the GTK documentation requires Meson 0.52.0')
   endif
 
-  # Use gtk-doc as a sub-project from the gtk-doc-for-gtk4 branch
-  # for the time being
-  dependency('gtk-doc', version: '>=1.99',
-    fallback: ['gtk-doc', 'dummy_dep'],
-    default_options: ['tests=false', 'yelp_manual=false'])
-
   glib_prefix = dependency('glib-2.0').get_pkgconfig_variable('prefix')
   glib_docpath = join_paths(glib_prefix, 'share', 'gtk-doc', 'html')
 
diff --git a/meson.build b/meson.build
index 5ad8508fb3..019b608c2a 100644
--- a/meson.build
+++ b/meson.build
@@ -382,6 +382,11 @@ graphene_dep   = dependency('graphene-gobject-1.0', version: graphene_req,
                             fallback: ['graphene', 'graphene_dep'])
 iso_codes_dep  = dependency('iso-codes', required: false)
 
+gtk_doc_dep    = dependency('gtk-doc', version: '>=1.99',
+                            fallback: ['gtk-doc', 'dummy_dep'],
+                            default_options: ['tests=false', 'yelp_manual=false'],
+                            required: get_option('gtk_doc'))
+
 fontconfig_dep = [] # only used in x11 backend
 
 if os_win32