[gnome-remote-desktop] build: Change get_pkgconfig_variable() to get_variable()

[Jonas Ådahl <jadahl src gnome org>]

commit 4b2c222faf4865546a90720af11ba793772a63bd
Author: Jonas Ådahl <jadahl gmail com>
Date:   Thu Sep 1 17:17:59 2022 +0200

    build: Change get_pkgconfig_variable() to get_variable()
    
    The former was deprecated.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 50581c40..a199811f 100644
--- a/meson.build
+++ b/meson.build
@@ -92,7 +92,7 @@ configinc = include_directories('.')
 servicedir = get_option('systemd_user_unit_dir')
 if systemd_dep.found()
   if servicedir == ''
-    servicedir = systemd_dep.get_pkgconfig_variable('systemduserunitdir')
+    servicedir = systemd_dep.get_variable(pkgconfig: 'systemduserunitdir')
   endif
 
   if servicedir == ''