[buoh] build: use SPDX license identifier in Meson file

[Jan Tojnar <jtojnar src gnome org>]

commit ed610214de661a16685ba09e375f9a310fedfaeb
Author: Jan Tojnar <jtojnar gmail com>
Date:   Mon Nov 1 08:32:25 2021 +0100

    build: use SPDX license identifier in Meson file

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 518c0d3..1e60e92 100644
--- a/meson.build
+++ b/meson.build
@@ -1,7 +1,7 @@
 project(
   'buoh',
   'c',
-  license: 'GPL2+',
+  license: 'GPL-2.0-or-later',
   version: '0.8.3',
   default_options: [
     'b_ndebug=if-release',