[pybliographer/gtk3] build: Enable AM_SILENT_RULES

[Germán Poó Caamaño <gpoo src gnome org>]

commit 99812e94372d1dbc19c83ec181c14fe2d2148c59
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Thu Mar 20 10:55:25 2014 -0700

    build: Enable AM_SILENT_RULES

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 719f73a..1581933 100644
--- a/configure.ac
+++ b/configure.ac
@@ -25,6 +25,7 @@ AC_PREREQ(2.57)
 
 AC_INIT([pybliographer], [1.2.15])
 AM_INIT_AUTOMAKE
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 AC_CONFIG_SRCDIR(pybliographer.py)