[gnome-online-accounts/wip/jtojnar/post-install] build: Use gnome.post_install() function

[Jan Tojnar <jtojnar src gnome org>]

commit 49daccd91b854c3e2acf10372227555cc131cf4a
Author: Jan Tojnar <jtojnar gmail com>
Date:   Thu Sep 8 13:56:18 2022 +0200

    build: Use gnome.post_install() function
    
    Introduced in Meson 0.57.0, it simplifies the code a bit:
    https://mesonbuild.com/Gnome-module.html#gnomepost_install

 meson.build           |  9 ++++-----
 meson_post_install.py | 17 -----------------
 2 files changed, 4 insertions(+), 22 deletions(-)
---
diff --git a/meson.build b/meson.build
index 4bf81d39..562451be 100644
--- a/meson.build
+++ b/meson.build
@@ -3,7 +3,7 @@ project(
   version: '3.45.3',
   license: 'LGPL2+',
   default_options: 'buildtype=debugoptimized',
-  meson_version: '>= 0.56.0'
+  meson_version: '>= 0.57.0',
 )
 
 goa_name = 'goa'
@@ -265,10 +265,9 @@ endif
 
 subdir('po')
 
-meson.add_install_script(
-  'meson_post_install.py',
-  goa_datadir,
-  enable_goabackend ? 'compile-schemas' : ''
+gnome.post_install(
+  glib_compile_schemas: true,
+  gtk_update_icon_cache: true,
 )
 
 summary({