Add silent rules to corosync make to more easily find warnings

Signed-off-by: Steven Dake <sdake@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

configure.ac

@@ -9,6 +9,7 @@ AC_INIT([corosync],
 	[openais@lists.osdl.org])
 
 AM_INIT_AUTOMAKE([-Wno-portability])
+AM_SILENT_RULES([yes])
 
 AC_CONFIG_SRCDIR([lib/cpg.c])
 AC_CONFIG_HEADER([include/corosync/config.h include/corosync/cs_config.h])