Revert "Fix deprecated items (#156)" (#209)

This reverts commit 5a9b3d1408.

android/build.gradle

@@ -91,12 +91,12 @@ afterEvaluate { project ->
     }
 
     task androidJavadocJar(type: Jar, dependsOn: androidJavadoc) {
-        archiveClassifier.set('javadoc')
+        classifier = 'javadoc'
         from androidJavadoc.destinationDir
     }
 
     task androidSourcesJar(type: Jar) {
-        archiveClassifier.set('sources')
+        classifier = 'sources'
         from android.sourceSets.main.java.srcDirs
         include '**/*.java'
     }

android/gradle.properties

@@ -17,5 +17,6 @@ org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryErro
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 
+android.useDeprecatedNdk=true
 android.useAndroidX=true
 android.enableJetifier=true