build: silent rules

* configure.ac: Ask for silent builds.
Upgrade to AC_CONFIG_HEADERS.

configure.ac

@@ -15,7 +15,7 @@
 ## -------------------------------------
 ## Project
 AC_INIT([MonoBURG], [1.0.6])
-AM_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 
 ## -------------------------------------
 ## Set up the Autotools
@@ -27,7 +27,8 @@ AC_PREREQ([2.57])
 AC_CONFIG_AUX_DIR([build-aux])
 
 # Initiate automake.
-AM_INIT_AUTOMAKE([1.7.5 dist-bzip2 check-news -Wall])
+AM_INIT_AUTOMAKE([1.12 silent-rules dist-bzip2 check-news -Wall])
+AM_SILENT_RULES([yes])
 
 ## -------------------------------------
 ## Development tools