Revert "+-JDK and -NOSTDLIB options"

This reverts commit 8222011874.

+- JDK will be restored in next commit

removal of -STDLIB was requested by Andrey Breslav

compiler/testData/checkerWithErrorTypes/full/Casts.jet

@@ -1,5 +1,3 @@
-// -JDK
-
 fun test() : Unit {
   var x : Int? = 0
   var y : Int = 0
@@ -15,4 +13,4 @@ fun test() : Unit {
   x <!USELESS_CAST!>as?<!> Int? : Int?
   y <!USELESS_CAST_STATIC_ASSERT_IS_FINE!>as?<!> Int? : Int?
   ()
-}
+}