Update Android build tools (#8010)

src/openrct2-android/app/build.gradle

@@ -2,7 +2,7 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 25
-    buildToolsVersion '25.0.2'
+    buildToolsVersion '28.0.2'
 
     defaultConfig {
         applicationId 'website.openrct2'
@@ -45,6 +45,13 @@ android {
         }
     }
 
+    flavorDimensions "version"
+    productFlavors {
+        full {
+            dimension "version"
+        }
+    }
+
     externalNativeBuild {
         cmake {
             path 'src/main/CMakeLists.txt'

src/openrct2-android/build.gradle

@@ -3,12 +3,13 @@
 buildscript {
     repositories {
         jcenter()
+        google()
         maven {
             url "https://oss.sonatype.org/content/repositories/snapshots/"
         }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.3.3'
+        classpath 'com.android.tools.build:gradle:3.1.0'
         classpath 'de.undercouch:gradle-download-task:3.2.0'
         classpath 'com.google.gms:google-services:3.0.0'
         // NOTE: Do not place your application dependencies here; they belong

src/openrct2-android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-all.zip