Native: move samples to backend.native/tests/

kotlin-native/backend.native/tests/samples/win32/build.gradle.kts

@@ -0,0 +1,14 @@
+plugins {
+    kotlin("multiplatform")
+}
+
+kotlin {
+    mingwX64("win32") {
+        binaries {
+            executable {
+                entryPoint = "sample.win32.main"
+                linkerOpts("-Wl,--subsystem,windows")
+            }
+        }
+    }
+}

kotlin-native/backend.native/tests/samples/win32/gradle.properties

@@ -0,0 +1,2 @@
+kotlin.code.style=official
+kotlin.import.noCommonSourceSets=true

kotlin-native/backend.native/tests/samples/win32/src/win32Main/kotlin/MessageBox.kt

@@ -0,0 +1,21 @@
+/*
+ * Copyright 2010-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
+ * that can be found in the license/LICENSE.txt file.
+ */
+
+package sample.win32
+
+import kotlinx.cinterop.*
+import platform.windows.*
+
+fun main() {
+    val message = StringBuilder()
+    memScoped {
+      val buffer = allocArray<UShortVar>(MAX_PATH)
+      GetModuleFileNameW(null, buffer, MAX_PATH)
+      val path = buffer.toKString().split("\\").dropLast(1).joinToString("\\")
+      message.append("Я нахожусь в $path\n")
+    }
+    MessageBoxW(null, "Konan говорит:\nЗДРАВСТВУЙ МИР!\n$message",
+            "Заголовок окна", (MB_YESNOCANCEL or MB_ICONQUESTION).convert())
+}