[telegnome] Enable silent rules if available

[Colin Watson <cjwatson src gnome org>]

commit fd04a45963dc679ce1b70ad865e4e248702a9329
Author: Colin Watson <cjwatson debian org>
Date:   Wed Feb 3 04:13:08 2016 +0000

    Enable silent rules if available
    
    * configure.ac: Use silent rules by default if Automake 1.11 is
    available.

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 0537cce..f35a676 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,6 +7,7 @@ AM_CONFIG_HEADER(config.h)
 AM_INIT_AUTOMAKE([dist-xz no-dist-gzip])
 
 AM_MAINTAINER_MODE
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 GNOME_COMMON_INIT
 GNOME_DEBUG_CHECK