build: use AM_SILENT_RULES unconditionally even for client projects.

build/autotools/m4/lol-conf.m4

@@ -15,6 +15,9 @@ dnl
 # ---------------------
 AC_DEFUN([LOL_AC_INIT], [
 
+dnl  Silent rules by default
+AM_SILENT_RULES([yes])
+
 dnl  C++11 and later mode. Checked early so that we don't run into surprises.
 version_flag=''
 LOL_TRY_CXXFLAGS(-std=c++0x, [version_flag='-std=c++0x'])

configure.ac

@@ -14,7 +14,6 @@ AC_INIT(lolengine, 0.0)
 AC_PREREQ(2.50)
 AC_CONFIG_AUX_DIR(.auto)
 AC_CANONICAL_SYSTEM
-m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 AM_INIT_AUTOMAKE([subdir-objects no-define tar-ustar silent-rules])
 dnl AM_MAINTAINER_MODE