gradle: reabstract package name

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

gradle.properties

@@ -1,3 +1,7 @@
+wireguardVersionCode=501
+wireguardVersionName=1.0.20230502
+wireguardPackageName=com.wireguard.android
+
 # When configured, Gradle will run in incubating parallel mode.
 # This option should only be used with decoupled projects. More details, visit
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
@@ -63,9 +67,6 @@ android.suppressUnsupportedOptionWarnings=android.keepWorkerActionServicesBetwee
   android.enableAppCompileTimeRClass,\
   android.suppressUnsupportedOptionWarnings
 
-wireguardVersionCode=501
-wireguardVersionName=1.0.20230502
-
 # OSSRH sometimes struggles with slow deployments, so this makes Gradle
 # more tolerant to those delays.
 systemProp.org.gradle.internal.http.connectionTimeout=500000