[gradle-plugin] Fix path to artifacts with prefixes

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/tasks/KonanBaseTasks.kt

@@ -62,13 +62,13 @@ abstract class KonanTargetableTask: DefaultTask() {
 abstract class KonanArtifactTask: KonanTargetableTask(), KonanArtifactSpec {
 
     open val artifact: File
-        @OutputFile get() = destinationDir.resolve(artifactNameWithSuffix)
+        @OutputFile get() = destinationDir.resolve(artifactFullName)
 
     @Internal lateinit var destinationDir: File
     @Internal lateinit var artifactName: String
 
-    protected val artifactNameWithSuffix: String
+    protected val artifactFullName: String
-        @Internal get() = "$artifactName$artifactSuffix"
+        @Internal get() = "$artifactPrefix$artifactName$artifactSuffix"
 
     val artifactPath: String
         @Internal get() = artifact.canonicalPath
@@ -76,6 +76,9 @@ abstract class KonanArtifactTask: KonanTargetableTask(), KonanArtifactSpec {
     protected abstract val artifactSuffix: String
         @Internal get
 
+    protected abstract val artifactPrefix: String
+        @Internal get
+
     internal open fun init(destinationDir: File, artifactName: String, target: KonanTarget) {
         super.init(target)
         this.destinationDir = destinationDir

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/tasks/KonanCompileTask.kt

@@ -46,6 +46,9 @@ abstract class KonanCompileTask: KonanBuildingTask(), KonanCompileSpec {
     override val artifactSuffix: String
         @Internal get() = produce.kind.suffix(konanTarget)
 
+    override val artifactPrefix: String
+        @Internal get() = produce.kind.prefix(konanTarget)
+
     // Other compilation parameters -------------------------------------------
 
     protected val srcFiles_ = mutableSetOf<FileCollection>()

tools/kotlin-native-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/tasks/KonanInteropTask.kt

@@ -44,6 +44,9 @@ open class KonanInteropTask: KonanBuildingTask(), KonanInteropSpec {
     override val artifactSuffix: String
         @Internal get() = ".klib"
 
+    override val artifactPrefix: String
+        @Internal get() = ""
+
     // Interop stub generator parameters -------------------------------------
 
     @InputFile lateinit var defFile: File