[K/N][tests] Added test for @ character in library name

kotlin-native/backend.native/tests/link/klib_name/lib.kt

@@ -0,0 +1,8 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+fun foo() {
+    println("linked library")
+}

kotlin-native/backend.native/tests/link/klib_name/prog.kt

@@ -0,0 +1,9 @@
+/*
+ * Copyright 2010-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the LICENSE file.
+ */
+
+
+fun main(args: Array<String>) {
+    foo()
+}

kotlin-native/backend.native/tests/link/klib_name/prog.out

@@ -0,0 +1 @@
+linked library