Stop building metalava shadow jars.

We no longer use shadow jars in androidx. Remove building
them.

Test: ./gradlew
Change-Id: Ie5432f0f80cc7c3fc651b92f8258d1fe76e45ab0
diff --git a/build.gradle.kts b/build.gradle.kts
index 55b87f8..9843450 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -1,4 +1,3 @@
-import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
 import org.gradle.api.tasks.testing.logging.TestLogEvent
 import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import java.io.FileInputStream
@@ -16,7 +15,7 @@
 
 buildDir = getBuildDirectory()
 
-defaultTasks = listOf("installDist", "test", "shadowJar", "createArchive", "ktlint")
+defaultTasks = mutableListOf("installDist", "test", "createArchive", "ktlint")
 
 repositories {
     google()
@@ -34,7 +33,6 @@
     kotlin("jvm") version "1.3.72"
     id("application")
     id("java")
-    id("com.github.johnrengelman.shadow") version "4.0.4"
     id("maven-publish")
 }
 
@@ -85,14 +83,6 @@
     testImplementation("junit:junit:4.11")
 }
 
-tasks.withType(ShadowJar::class.java) {
-    archiveBaseName.set("metalava-full-${project.version}")
-    archiveClassifier.set(null as String?)
-    archiveVersion.set(null as String?)
-    setZip64(true)
-    destinationDirectory.set(getDistributionDirectory())
-}
-
 tasks.withType(Test::class.java) {
     testLogging.events = hashSetOf(
         TestLogEvent.FAILED,