Revert of "Merge pull request #4014 from sgjava:opencv-sgjava" (reverted from commit 52fa55a770)

modules/core/misc/java/src/java/core+Mat.java

@@ -640,7 +640,6 @@ public class Mat {
     {
 
         n_release(nativeObj);
-        n_delete(nativeObj);
 
         return;
     }
@@ -907,6 +906,12 @@ public class Mat {
         return retVal;
     }
 
+    @Override
+    protected void finalize() throws Throwable {
+        n_delete(nativeObj);
+        super.finalize();
+    }
+
     // javadoc:Mat::toString()
     @Override
     public String toString() {