Remove pluginMetadata left over

tools/kotlin-native-gradle-plugin/build.gradle

@@ -54,22 +54,6 @@ repositories {
     }
 }
 
-task pluginMetadata {
-    def outputDir = file("$buildDir/$name")
-
-    inputs.files sourceSets.main.runtimeClasspath
-    outputs.dir outputDir
-
-    doLast {
-        outputDir.mkdirs()
-        def metadata = new Properties()
-        metadata.put("implementation-classpath", sourceSets.main.runtimeClasspath.join(File.pathSeparator))
-        file("$outputDir/plugin-under-test-metadata.properties").withPrintWriter {
-            metadata.store(it, "Plugin metadata")
-        }
-    }
-}
-
 configurations {
     bundleDependencies {
         transitive = false
@@ -90,7 +74,6 @@ dependencies {
     testCompile('org.spockframework:spock-core:1.1-groovy-2.4') {
         exclude module: 'groovy-all'
     }
-    testRuntime files(pluginMetadata)
 }
 
 shadowJar {