[gtk: 4/5] meson: Use a valid SPDX identifier

[Matthias Clasen <matthiasc src gnome org>]

commit 94c2072be8b09a1b977dfe2ab7d77bd44513a6e1
Author: Maximiliano Sandoval R <msandova protonmail com>
Date:   Fri Jul 16 10:46:53 2021 +0200

    meson: Use a valid SPDX identifier
    
    See https://mesonbuild.com/Reference-manual.html#license

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e6382b7db0..1b5740a53c 100644
--- a/meson.build
+++ b/meson.build
@@ -8,7 +8,7 @@ project('gtk', 'c',
           'c_std=gnu99',
         ],
         meson_version : '>= 0.55',
-        license: 'LGPLv2.1+')
+        license: 'LGPL-2.1-or-later')
 
 glib_req           = '>= 2.66.0'
 pango_req          = '>= 1.47.0' # keep this in sync with .gitlab-ci/test-msys.sh