Konvert muzzle plugin definition to Kotlin

buildSrc/build.gradle

@@ -1,18 +0,0 @@
-apply plugin: 'groovy'
-
-repositories {
-  jcenter()
-}
-
-dependencies {
-  compile gradleApi()
-  compile localGroovy()
-
-  compile group: 'org.eclipse.aether', name: 'aether-connector-basic', version: '1.1.0'
-  compile group: 'org.eclipse.aether', name: 'aether-transport-http', version: '1.1.0'
-  compile group: 'org.apache.maven', name: 'maven-aether-provider', version: '3.3.9'
-
-  compile group: 'com.google.guava', name: 'guava', version: '20.0'
-  compile group: 'org.ow2.asm', name: 'asm', version: '7.0-beta'
-  compile group: 'org.ow2.asm', name: 'asm-tree', version: '7.0-beta'
-}

buildSrc/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+  groovy
+  `java-gradle-plugin`
+}
+
+gradlePlugin {
+  plugins {
+    create("muzzle-plugin") {
+      id = "muzzle"
+      implementationClass = "MuzzlePlugin"
+    }
+  }
+}
+
+repositories {
+  jcenter()
+}
+
+dependencies {
+  compile(gradleApi())
+  compile(localGroovy())
+
+  compile("org.eclipse.aether", "aether-connector-basic", "1.1.0")
+  compile("org.eclipse.aether", "aether-transport-http", "1.1.0")
+  compile("org.apache.maven", "maven-aether-provider", "3.3.9")
+
+  compile("com.google.guava", "guava", "20.0")
+  compile("org.ow2.asm", "asm", "7.0-beta")
+  compile("org.ow2.asm", "asm-tree", "7.0-beta")
+}