[K/N] Header klibs: Keep private properties in value classes

^KT-61767 Fixed

native/native.tests/testData/klib/header-klibs/compilation/classes/lib/classes.kt

@@ -28,4 +28,6 @@ class B : A() {
     companion object {
         const val bConst: Int = 90
     }
-}
+}
+
+value class C(private val b: String)

native/native.tests/testData/klib/header-klibs/compilation/classes/main/main.kt

@@ -31,10 +31,15 @@ fun useB(b: B) {
     B.bConst
 }
 
+fun useC(b: String) {
+    C(b)
+}
+
 fun runAppAndReturnOk(): String {
     useI(A())
     useA(A())
     useB(B())
+    useC("test")
 
     return "OK"
 }