[K2/N] Export C adapters for non-root packages

^KT-56182

Merge-request: KT-MR-10160
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

kotlin-native/backend.native/tests/interop/kt56182_root_subpackage2lvl/knlibrary.kt

@@ -0,0 +1,30 @@
+// This test is similar to kt42397, just everything is doubled: in "package knlibrary.subpackage" and the root package
+
+// FILE: SecondLevelPackage.kt
+package knlibrary.subpackage
+
+import kotlin.native.Platform
+
+// The following 2 singletons are unused. However, since we are generating C bindings for them,
+// they should be marked as used, so that the code generator emits their deinitialization.
+
+object A {}
+
+class B {
+    companion object {}
+}
+
+fun enableMemoryChecker() {
+    Platform.isMemoryLeakCheckerActive = true
+}
+
+// FILE: rootPackage.kt
+object A {}
+
+class B {
+    companion object {}
+}
+
+fun enableMemoryChecker() {
+    Platform.isMemoryLeakCheckerActive = true
+}