protected & internal are now forbidden in interfaces

compiler/testData/codegen/box/classes/kt2477.kt

@@ -6,11 +6,12 @@ interface A {
 }
 
 interface B {
-    protected val c: String
+    private val c: String
+        get() = "FAIL"
 }
 
-open class C {
-    private val c: String = "FAIL"
+abstract class C {
+    abstract protected val c: String
 }
 
 open class D: C(), A, B {

compiler/testData/codegen/box/traits/inheritProtectedInterfaceMembers.kt

@@ -1,30 +0,0 @@
-interface A {
-    protected fun foo()
-
-    protected fun fooImpl() { }
-
-    protected var bar: Int
-
-    public var baz: String
-        public get() = ""
-        protected set(value) {}
-
-    fun test(): String {
-        foo()
-        fooImpl()
-        bar = bar + 1
-        baz = baz + "1"
-        return "OK"
-    }
-}
-
-class B : A {
-    protected override fun foo() {}
-
-    protected override var bar: Int = 42
-
-    override var baz: String = ""
-        protected set
-}
-
-fun box() = B().test()

compiler/testData/codegen/box/traits/protectedClassInInterface.kt

@@ -1,11 +0,0 @@
-interface Foo {
-    protected class Bar {
-        fun box() = "OK"
-    }
-}
-
-class Baz : Foo {
-    fun box() = Foo.Bar().box()
-}
-
-fun box() = Baz().box()

compiler/testData/codegen/box/traits/protectedFunDiamond.kt

@@ -1,15 +0,0 @@
-interface A {
-    protected fun foo(): String
-
-    fun box() = foo()
-}
-
-interface B : A
-
-interface C : A {
-    protected override fun foo() = "OK"
-}
-
-class D : B, C
-
-fun box() = D().box()