[libadwaita] Add Meson dependency override

[Alexander Mikhaylenko <alexm src gnome org>]

commit 63690841fb0e7ea0a0bdbe129b65824cf6571fd9
Author: Tristan Partin <tristan partin io>
Date:   Tue Oct 19 01:03:52 2021 -0500

    Add Meson dependency override
    
    This signals to parent projects that libadwaita will provide
    libadwaita-1. This simplifies using libadwaita as a subprojects and
    follows recent Meson practices.

 src/meson.build | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/meson.build b/src/meson.build
index 9a3be48e..1b766865 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -278,6 +278,8 @@ libadwaita_dep = declare_dependency(
   include_directories: include_directories('.'),
 )
 
+meson.override_dependency(package_api_name, libadwaita_dep)
+
 if introspection
 
    libadwaita_gir_extra_args = [