[gtksourceview] Enable silent mode if using a modern automake

[Paolo Borelli <pborelli src gnome org>]

commit 244d0b815df255ddde54a65c4c7e7a49c2d3c0ec
Author: Paolo Borelli <porelli gnome org>
Date:   Sat Jun 27 18:45:47 2009 +0200

    Enable silent mode if using a modern automake

 configure.ac |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index dab46ed..e37f41b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -18,6 +18,7 @@ dnl make sure we keep ACLOCAL_FLAGS around for maintainer builds to work
 AC_SUBST(ACLOCAL_AMFLAGS, "$ACLOCAL_FLAGS")
 
 AM_MAINTAINER_MODE
+m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
 AC_ISC_POSIX
 AC_PROG_CC