Adapt script and instructions for alt config.h
diff --git a/tests/scripts/test-ref-configs.pl b/tests/scripts/test-ref-configs.pl
index 4577252..42131be 100755
--- a/tests/scripts/test-ref-configs.pl
+++ b/tests/scripts/test-ref-configs.pl
@@ -49,7 +49,7 @@
     print "* Testing configuration: $conf\n";
     print "******************************************\n";
 
-    system( "scripts/activate-config.pl configs/$conf" )
+    system( "cp configs/$conf $config_h" )
         and abort "Failed to activate $conf\n";
 
     system( "make" ) and abort "Failed to build: $conf\n";