[android] - Fix crash on dalvik due to missing finalizers

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/BackgroundLayer.java

@@ -70,4 +70,8 @@ public class BackgroundLayer extends Layer {
 
     private native Object nativeGetBackgroundOpacity();
 
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/CircleLayer.java

@@ -132,4 +132,8 @@ public class CircleLayer extends Layer {
 
     private native Object nativeGetCirclePitchScale();
 
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/CustomLayer.java

@@ -27,4 +27,7 @@ public class CustomLayer extends Layer {
 
     protected native void nativeUpdate();
 
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/FillLayer.java

@@ -147,4 +147,8 @@ public class FillLayer extends Layer {
 
     private native Object nativeGetFillPattern();
 
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/LineLayer.java

@@ -188,4 +188,8 @@ public class LineLayer extends Layer {
 
     private native Object nativeGetLinePattern();
 
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/RasterLayer.java

@@ -97,4 +97,8 @@ public class RasterLayer extends Layer {
 
     private native Object nativeGetRasterFadeDuration();
 
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/SymbolLayer.java

@@ -505,4 +505,8 @@ public class SymbolLayer extends Layer {
 
     private native Object nativeGetTextTranslateAnchor();
 
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/layer.java.ejs

@@ -104,4 +104,8 @@ public class <%- camelize(type) %>Layer extends Layer {
     private native Object nativeGet<%- camelize(property.name) %>();
 
 <% } -%>
+
+    @Override
+    protected native void finalize() throws Throwable;
+
 }