[gtk-doc] meson: also add highlight.py to meson.build

[Stefan Sauer <stefkost src gnome org>]

commit 0ecfc90bae51c41ed2ded3402b5623e5528de4dd
Author: Stefan Sauer <ensonic users sf net>
Date:   Mon Apr 15 19:26:17 2019 +0200

    meson: also add highlight.py to meson.build

 gtkdoc/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtkdoc/meson.build b/gtkdoc/meson.build
index fac9d10..8975023 100644
--- a/gtkdoc/meson.build
+++ b/gtkdoc/meson.build
@@ -29,6 +29,7 @@ gtkdoc_sources = [
   'check.py',
   'common.py',
   'fixxref.py',
+  'highlight.py',
   'md_to_db.py',
   'mkdb.py',
   'mkhtml.py',