[atk: 1/2] Fix building atk as subproject

[Samuel Thibault <sthibaul src gnome org>]

commit a38b7b654cf7bcdc9037ba38979dd3cc5276d8a5
Author: Samuel Thibault <samuel thibault ens-lyon org>
Date:   Sun Nov 17 01:00:55 2019 +0100

    Fix building atk as subproject
    
    Using #include <atk/atk.h> (e.g. in at-spi2-atk) requires the root_inc as
    well.

 atk/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/atk/meson.build b/atk/meson.build
index dcde8a4..79f37f6 100644
--- a/atk/meson.build
+++ b/atk/meson.build
@@ -153,7 +153,7 @@ if get_option('introspection')
 endif
 
 libatk_dep = declare_dependency(link_with: libatk,
-  include_directories: atk_inc,
+  include_directories: [ root_inc, atk_inc ],
   dependencies: glib_dep,
   sources: atk_sources_dep,
 )