remove _inUnitTest flag

- it was used to suppress stderr message during unit test

src/rt/minfo.d

@@ -366,21 +366,13 @@ struct StackRec
 
 void onCycleError(StackRec[] stack)
 {
-    string msg = "Aborting";
-    version (unittest)
-    {
-        if (_inUnitTest)
-            goto Lerror;
-    }
-
-    msg ~= ": Cycle detected between modules with ctors/dtors:\n";
+    string msg = "Aborting: Cycle detected between modules with ctors/dtors:\n";
     foreach (e; stack)
     {
         msg ~= e.mod.name;
         msg ~= " -> ";
     }
     msg ~= stack[0].mod.name;
- Lerror:
     throw new Exception(msg);
 }
 
@@ -498,14 +490,8 @@ private void sortCtorsImpl(ref ModuleGroup mgroup, StackRec[] stack)
     }
 }
 
-version (unittest)
-  bool _inUnitTest;
-
 unittest
 {
-    _inUnitTest = true;
-    scope (exit) _inUnitTest = false;
-
     static void assertThrown(T : Throwable, E)(lazy E expr)
     {
         try