build: silent rules

* configure.ac: Ask for silent builds.
Require Automake 1.12+.

configure.ac

@@ -13,8 +13,8 @@ AC_INIT([Nolimips], [0.9a], [projects@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([build-aux])
 
 # Initialize automake.
-AM_INIT_AUTOMAKE([foreign 1.7.5 dist-bzip2])
-
+AM_INIT_AUTOMAKE([foreign 1.12 silent-rules dist-bzip2])
+AM_SILENT_RULES([yes])
 
 ## Development tools -------------------
 # Look for a lex-like program.