Reallow ill-kinded but JavaDefined parents (scala#5010)

To allow again t3613 to compile I need this exception. But the testcase is so
old I'm not sure if we should do this, even tho it's still supported by Scalac.

Author: Blaisorblade

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -1524,7 +1524,8 @@ class Typer extends Namer
         ctx.error(i"$psym is extended twice", tree.pos)
       seenParents += psym
       if (tree.isType) {
-        checkSimpleKinded(result) // Not needed for constructor calls, as type arguments will be inferred.
+        if (!psym.is(JavaDefined))
+          checkSimpleKinded(result) // Not needed for constructor calls, as type arguments will be inferred.
         if (psym.is(Trait) && !cls.is(Trait) && !cls.superClass.isSubClass(psym))
           result = maybeCall(result, psym, psym.primaryConstructor.info)
       }