[libxslt] configure: support silent automake rules if possible

[Stefan Kost <stefkost src gnome org>]

commit 3cc41f1574b59b667ce7bf7fe6de8eba5b2b8157
Author: Stefan Kost <ensonic users sf net>
Date:   Tue May 10 10:35:43 2011 +0300

    configure: support silent automake rules if possible
    
    This gives us a much less noisy build and makes error stand out a lot more.

 configure.in |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/configure.in b/configure.in
index 243173b..7ee1a19 100644
--- a/configure.in
+++ b/configure.in
@@ -86,6 +86,11 @@ AM_INIT_AUTOMAKE($PACKAGE, $VERSION)
 
 # AM_MAINTAINER_MODE
 
+# Support silent build rules, requires at least automake-1.11. Disable
+# by either passing --disable-silent-rules to configure or passing V=1
+# to make
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
 dnl
 dnl Specific dir for HTML output ?
 dnl