It makes the compilation visually cleaner and the warnings easier to spot.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

configure.ac

@@ -42,6 +42,7 @@ AC_CONFIG_SRCDIR([Makefile.am])
 AM_INIT_AUTOMAKE([dist-bzip2])
 
 AM_CONFIG_HEADER([config.h])
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 LIBVA_MAJOR_VERSION=libva_major_version
 LIBVA_MINOR_VERSION=libva_minor_version