[krb5-auth-dialog] Don't use deprecated GNOME2_MACROS

[Guido Günther <guidog src gnome org>]

commit d6506af0760887b982bc84b5b98d80d81f6c4ed4
Author: Guido Günther <agx sigxcpu org>
Date:   Thu Jul 21 12:46:10 2016 +0200

    Don't use deprecated GNOME2_MACROS

 autogen.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/autogen.sh b/autogen.sh
index e3558bd..b978d3f 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -19,4 +19,4 @@ which gnome-autogen.sh || {
     echo "You need to install gnome-common from the GNOME CVS"
     exit 1
 }
-USE_GNOME2_MACROS=1 . gnome-autogen.sh
+. gnome-autogen.sh