Android: Fix build.gradle

Configuration 'compile' is obsolete and has been replaced with
'implementation' and 'api'.
It will be removed at the end of 2018. For more information
see: http://d.android.com/r/tools/update-dependency-configurations.html

Task-number: QTBUG-71570
Change-Id: I6f498d8cb3ff01ad641aee697496e3dc56059a72
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>

src/android/templates/build.gradle

@@ -17,7 +17,7 @@ repositories {
 apply plugin: 'com.android.application'
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
 }
 
 android {