[gnome-chess/wip/jtojnar/mpi4] build: Update meson_post_install.py for GTK 4

[Jan Tojnar <jtojnar src gnome org>]

commit 994fcb66a287111b0cafb1d8fd0c1d48f1954543
Author: Jan Tojnar <jtojnar gmail com>
Date:   Thu Mar 25 09:17:38 2021 +0000

    build: Update meson_post_install.py for GTK 4

 meson_post_install.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson_post_install.py b/meson_post_install.py
index bf320a9..b5ed74e 100644
--- a/meson_post_install.py
+++ b/meson_post_install.py
@@ -9,7 +9,7 @@ schemadir = os.path.join(install_prefix, 'share', 'glib-2.0', 'schemas')
 
 if not os.environ.get('DESTDIR'):
   print('Update icon cache...')
-  subprocess.call(['gtk-update-icon-cache', '-f', '-t', icondir])
+  subprocess.call(['gtk4-update-icon-cache', '-f', '-t', icondir])
 
   print('Compiling gsettings schemas...')
   subprocess.call(['glib-compile-schemas', schemadir])