[gtk/wip/chergert/quartz4u] build: add atk subproject

[Christian Hergert <chergert src gnome org>]

commit c8db9bfafbaf2ce4602a106d706030a1d415ee80
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 28 12:48:57 2020 -0700

    build: add atk subproject

 meson.build          | 3 ++-
 subprojects/atk.wrap | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 75af273d9d..1989647427 100644
--- a/meson.build
+++ b/meson.build
@@ -374,7 +374,8 @@ pixbuf_dep     = dependency('gdk-pixbuf-2.0', version: gdk_pixbuf_req,
 epoxy_dep      = dependency('epoxy', version: epoxy_req,
                             fallback: ['libepoxy', 'libepoxy_dep'],
                             static: false)
-atk_dep        = dependency('atk', version: atk_req)
+atk_dep        = dependency('atk', version: atk_req,
+                            fallback : ['atk', 'libatk_dep'])
 harfbuzz_dep   = dependency('harfbuzz', version: '>= 0.9', required: false)
 xkbdep         = dependency('xkbcommon', version: xkbcommon_req, required: wayland_enabled)
 graphene_dep   = dependency('graphene-gobject-1.0', version: graphene_req,
diff --git a/subprojects/atk.wrap b/subprojects/atk.wrap
new file mode 100644
index 0000000000..f6765c5bfa
--- /dev/null
+++ b/subprojects/atk.wrap
@@ -0,0 +1,5 @@
+[wrap-git]
+directory=atk
+url=https://gitlab.gnome.org/GNOME/atk.git
+push-url=ssh://git gitlab gnome org:GNOME/atk.git
+revision=master