Extract common maven logic for Java and Android libraries.

Bug: 64974262
Test: ./gradlew buildOnServer seems to be still happy
Change-Id: I6b1fd05506c0171799ea7088da52b31cdbeb9f4b
diff --git a/v13/build.gradle b/v13/build.gradle
index d2d7f44..06774fd 100644
--- a/v13/build.gradle
+++ b/v13/build.gradle
@@ -1,4 +1,4 @@
-apply plugin: android.support.SupportLibraryPlugin
+apply plugin: android.support.SupportAndroidLibraryPlugin
 
 dependencies {
     api project(':support-annotations')