systemd: add glib-2.0 to DEPENDS

* | No package 'glib-2.0' found
  | No package 'gobject-2.0' found
  | configure:16371: error: Package requirements (glib-2.0 >= 2.22.0 gobject-2.0 >= 2.22.0) were not met:
  |
  | No package 'glib-2.0' found
  | No package 'gobject-2.0' found

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>