[gnome-session] build: remove old EggSMClient leftover

[Ray Strode <halfline src gnome org>]

commit 4418042cf5cf91b5d23fe13912c8e7939b44f62a
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Oct 25 19:32:40 2014 -0700

    build: remove old EggSMClient leftover
    
    https://bugzilla.gnome.org/show_bug.cgi?id=622924

 configure.ac |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 6485d57..35e3c29 100644
--- a/configure.ac
+++ b/configure.ac
@@ -88,8 +88,6 @@ PKG_CHECK_MODULES(XEXT, xext xau)
 
 PKG_CHECK_MODULES(DBUS_GLIB, dbus-glib-1 >= $DBUS_GLIB_REQUIRED)
 
-PKG_CHECK_MODULES(EGG_SMCLIENT, gtk+-3.0)
-
 PKG_CHECK_MODULES(GL_TEST, xcomposite gl glib-2.0)
 
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