[buoh] build: Use gnome.post_install instead of custom function

[Jan Tojnar <jtojnar src gnome org>]

commit eb4ce1530bce17f3d3203e0edb8210c66ab73718
Author: Jan Tojnar <jtojnar gmail com>
Date:   Mon Feb 21 16:08:02 2022 +0100

    build: Use gnome.post_install instead of custom function

 build-aux/post-install.py | 16 ----------------
 data/icons/meson.build    |  2 +-
 meson.build               | 10 ++++------
 3 files changed, 5 insertions(+), 23 deletions(-)
---
diff --git a/data/icons/meson.build b/data/icons/meson.build
index 8134560..12fa304 100644
--- a/data/icons/meson.build
+++ b/data/icons/meson.build
@@ -10,6 +10,6 @@ icon_sizes = [
 foreach icon_size : icon_sizes
   install_data(
     join_paths(icon_size, 'buoh.png'),
-    install_dir: join_paths(datadir, 'icons', 'hicolor', icon_size, 'apps'),
+    install_dir: join_paths(icondir, icon_size, 'apps'),
   )
 endforeach
diff --git a/meson.build b/meson.build
index 88f2907..90b4ee7 100644
--- a/meson.build
+++ b/meson.build
@@ -6,6 +6,7 @@ project(
   default_options: [
     'b_ndebug=if-release',
   ],
+  meson_version: '>= 0.57.0'
 )
 
 gnome = import('gnome')
@@ -50,12 +51,9 @@ if appstream_util.found()
   )
 endif
 
-# Post-install scripts
-meson.add_install_script(
-  python3,
-  join_paths(meson.source_root(), 'build-aux', 'post-install.py'),
-  icondir,
-  schemadir,
+gnome.post_install(
+  glib_compile_schemas: true,
+  gtk_update_icon_cache: true,
 )
 
 # Subfolders