[gcr/wip/exalm/postinstall] meson: Clean up post_install()

[Alexander Mikhaylenko <alexm src gnome org>]

commit 94a88caa5e51592319759a4fe84bd761eb4ac11d
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sat Jun 18 18:38:48 2022 +0400

    meson: Clean up post_install()
    
    There are no desktop files, and only GTK3 builds have icons.
    
    Fixes https://gitlab.gnome.org/GNOME/gcr/-/issues/97

 meson.build | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 21a02fa2..0f14a690 100644
--- a/meson.build
+++ b/meson.build
@@ -144,7 +144,6 @@ endif
 
 # Post-install scripts
 gnome.post_install(
-  gtk_update_icon_cache: true,
+  gtk_update_icon_cache: get_option('gtk3'),
   glib_compile_schemas: true,
-  update_desktop_database: true,
 )