[libgweather/ebassi/gtk4] build: Add license field to project()

[Emmanuele Bassi <ebassi src gnome org>]

commit 2b5fb08c08f4e70bff963dee75f6735b46497812
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Oct 11 14:25:02 2021 +0100

    build: Add license field to project()
    
    It's advisory, and currently unused, but it's handy to have.

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index fdc84882..e2e5627f 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,6 @@
 project('libgweather', 'c',
   version: '40.0',
+  license: 'GPL-2.0-or-later',
   meson_version: '>= 0.55.0',
   default_options: [
     'warning_level=2',