Meson: Use gnome.post_install()

See https://github.com/mesonbuild/meson/pull/8272 and
https://github.com/mesonbuild/meson/issues/8268.

meson.build

@@ -798,14 +798,21 @@ subdir('po-properties')
 subdir('docs/tools')
 subdir('docs/reference')
 
-# Keep this in sync with post-install.sh expected arguments
 if not meson.is_cross_build()
+  if meson.version().version_compare('>=0.57.0')
+    gnome.post_install(
+      glib_compile_schemas: true,
+      gio_querymodules: gio_module_dirs,
+      gtk_update_icon_cache: true,
+    )
+  else
     meson.add_install_script('build-aux/meson/post-install.py',
                              gtk_api_version,
                              gtk_binary_version,
                              gtk_libdir,
                              gtk_datadir,
                              gtk_bindir)
+  endif
 else
   message('Not executing post-install steps automatically when cross compiling')
 endif

modules/meson.build

@@ -1,3 +1,4 @@
+gio_module_dirs = []
 if os_unix
   subdir('printbackends')
 else

modules/printbackends/meson.build

@@ -2,6 +2,7 @@ print_backends = []
 
 printbackends_subdir = 'gtk-4.0/@0@/printbackends'.format(gtk_binary_version)
 printbackends_install_dir = join_paths(get_option('libdir'), printbackends_subdir)
+gio_module_dirs += printbackends_install_dir
 
 printbackends_args = [
   '-DGTK_COMPILATION',

tools/meson.build

@@ -51,6 +51,7 @@ foreach tool: gtk_tools
   )
 
   set_variable(tool_name.underscorify(), exe) # used in testsuites
+  meson.override_find_program(tool_name, exe)
 endforeach
 
 # Data to install