configure.ac: enable silent rules

Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Signed-off-by: Mathieu Duponchelle <mathieu.duponchelle@opencreed.com>
Differential Revision: https://phabricator.apertis.org/D4127

configure.ac

@@ -17,6 +17,7 @@ AC_SUBST(PRESTWOOD_VERSION,prestwood_version)
 AC_SUBST([PRESTWOOD_API_VERSION],prestwood_major)
 
 AM_INIT_AUTOMAKE([-Wno-portability])
+AM_SILENT_RULES([yes])
 
 AC_PROG_CC
 AC_PROG_CXX