Samples: Get rid of KotlinNativeTarget and KonanTarget imports

samples/workers/build.gradle.kts

@@ -1,23 +1,20 @@
-import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinNativeTargetPreset
-
 plugins {
     kotlin("multiplatform")
 }
 
-// Determine host preset.
-val hostOs = System.getProperty("os.name")
-
-val hostPreset: KotlinNativeTargetPreset = when {
-    hostOs == "Mac OS X" -> "macosX64"
-    hostOs == "Linux" -> "linuxX64"
-    hostOs.startsWith("Windows") -> "mingwX64"
-    else -> throw GradleException("Host OS '$hostOs' is not supported in Kotlin/Native $project.")
-}.let {
-    kotlin.presets[it] as KotlinNativeTargetPreset
-}
-
 kotlin {
-    targetFromPreset(hostPreset, "workers") {
+    // Determine host preset.
+    val hostOs = System.getProperty("os.name")
+
+    // Create target for the host platform.
+    val hostTarget = when {
+        hostOs == "Mac OS X" -> macosX64("workers")
+        hostOs == "Linux" -> linuxX64("workers")
+        hostOs.startsWith("Windows") -> mingwX64("workers")
+        else -> throw GradleException("Host OS '$hostOs' is not supported in Kotlin/Native $project.")
+    }
+
+    hostTarget.apply {
         binaries {
             executable {
                 entryPoint = "sample.workers.main"