[K/N] Add some tests for https://youtrack.jetbrains.com/issue/KT-47605

kotlin-native/backend.native/tests/interop/mingw_dll_linkage/library.c

@@ -0,0 +1,5 @@
+#include "library.h"
+
+int f() {
+    return 43;
+}

kotlin-native/backend.native/tests/interop/mingw_dll_linkage/library.h

@@ -0,0 +1 @@
+int f();

kotlin-native/backend.native/tests/interop/mingw_dll_linkage/main.kt

@@ -0,0 +1,7 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+fun main() {
+}