[svn r354] Fix the regressions between [346] and [353] by making constructors and destructors outside classes fatal errors.

Fix tests makefile and add minimize to gc.d.

tests/testincludes/std/gc.d

@@ -194,7 +194,10 @@ void genCollect()
 /**
  * Minimizes physical memory usage
  */
-//void minimize();
+void minimize()
+{
+    GC.collect();
+}
 
 /***************************************
  * disable() temporarily disables garbage collection cycle, enable()