[gnome-session] build: Comment session selector and tracker checks

[Iñigo Martínez <inigomartinez src gnome org>]

commit 8948157b426416e172f210efa567850ccfbde308
Author: Iñigo Martínez <inigomartinez gmail com>
Date:   Fri Nov 17 10:45:04 2017 +0100

    build: Comment session selector and tracker checks
    
    The session selector support and session tracker support are next
    to each other.
    
    This patch comments where meson checks session selector and the
    session tracker support.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=790486

 meson.build |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/meson.build b/meson.build
index 5fcbd88..590b56a 100644
--- a/meson.build
+++ b/meson.build
@@ -111,8 +111,10 @@ session_bin_deps = session_deps + [
   sm_dep
 ]
 
+# Check for session selector GTK+ UI
 enable_session_selector = get_option('session_selector')
 
+# Check for session tracking backend
 session_tracking = 'null backend'
 
 enable_systemd = get_option('systemd')