[gnome-session] configure.ac: Remove EggSMClient leftover

[Ray Strode <halfline src gnome org>]

commit 2c40efd9123e30ea56563e9a47073b633c596bb2
Author: Javier Jardón <jjardon gnome org>
Date:   Thu Dec 10 14:30:02 2015 +0000

    configure.ac: Remove EggSMClient leftover
    
    EggSMClient has been removed in commit
    ed6cca527eaac201d6eb4ba49839811e7764c97e
    
    https://bugzilla.gnome.org/show_bug.cgi?id=591690

 configure.ac |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 29c164a..4bec336 100644
--- a/configure.ac
+++ b/configure.ac
@@ -85,8 +85,6 @@ PKG_CHECK_MODULES(SM, sm)
 PKG_CHECK_MODULES(ICE, ice)
 PKG_CHECK_MODULES(XEXT, xext xau)
 
-PKG_CHECK_MODULES(EGG_SMCLIENT, gtk+-3.0)
-
 PKG_CHECK_MODULES(GL_TEST, xcomposite gl glib-2.0)
 
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