Add a test-case for KT-43502

kotlin-native/backend.native/tests/interop/kt43502/kt43502.c

@@ -0,0 +1 @@
+char **externPtr = 0;

kotlin-native/backend.native/tests/interop/kt43502/kt43502.def

@@ -0,0 +1,2 @@
+libraryPaths = backend.native/tests/build/kt43502
+staticLibraries = kt43502.a

kotlin-native/backend.native/tests/interop/kt43502/kt43502.h

@@ -0,0 +1 @@
+extern char **externPtr;

kotlin-native/backend.native/tests/interop/kt43502/main.c

@@ -0,0 +1,5 @@
+#include "libinterop_kt43502_api.h"
+
+int main() {
+    libinterop_kt43502_symbols()->kotlin.root.printExternPtr();
+}

kotlin-native/backend.native/tests/interop/kt43502/main.kt

@@ -0,0 +1,5 @@
+import kt43502.*
+
+fun printExternPtr() {
+    println(externPtr)
+}