[tests] Disabled cpp TestThreads as it's hanging for now

tests/unit/Test.hx

@@ -258,7 +258,7 @@ class Test #if swf_mark implements mt.Protect #end {
 			#if ((dce == "full") && !interp && !as3)
 			new TestDCE(),
 			#end
-			#if ( (java || neko || cpp) && !macro && !interp)
+			#if ( (java || neko) && !macro && !interp)
 			new TestThreads(),
 			#end
 			//new TestUnspecified(),