Migrate buildconfig to Gradle build files

Author: mathiascode

app/build.gradle

@@ -12,6 +12,9 @@ android {
         versionName "1.6.0"
         vectorDrawables.useSupportLibrary = true
     }
+    buildFeatures {
+        buildConfig true
+    }
     buildTypes {
         release {
             minifyEnabled true

gradle.properties

@@ -9,7 +9,6 @@
 
 # Specifies the JVM arguments used for the daemon process.
 # The setting is particularly useful for tweaking memory settings.
-android.defaults.buildfeatures.buildconfig=true
 android.injected.testOnly=false
 android.nonFinalResIds=false
 android.nonTransitiveRClass=false