[K/N] Move cinterop tests from standalone to codegen/box

^KT-61259

compiler/testData/codegen/box/cinterop/auxiliarySources.kt

@@ -0,0 +1,41 @@
+// TARGET_BACKEND: NATIVE
+// FREE_CINTEROP_ARGS: -header auxiliaryCppSources.h
+
+// MODULE: cinterop
+// FILE: auxiliaryCppSources.def
+# The def file is intentionally empty
+# `auxiliaryCppSources.h` is meant to be included via `-header` free arg of cinterop tool
+
+// FILE: auxiliaryCppSources.h
+#ifdef __cplusplus
+extern "C" {
+    #endif
+
+    const char* name();
+
+    #ifdef __cplusplus
+}
+#endif
+
+// FILE: auxiliaryCppSources.cpp
+#include <string>
+#include "auxiliaryCppSources.h"
+
+static std::string _name = "OK";
+
+const char* name() {
+    return _name.c_str();
+}
+
+// MODULE: main(cinterop)
+// FILE: main.kt
+
+@file:OptIn(kotlinx.cinterop.ExperimentalForeignApi::class)
+
+import auxiliaryCppSources.*
+import kotlin.test.*
+import kotlinx.cinterop.*
+
+fun box(): String {
+    return name()!!.toKString()
+}