constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/android/graphics/Bitmap.cpp b/core/jni/android/graphics/Bitmap.cpp
index ceec0e3..a60816d 100755
--- a/core/jni/android/graphics/Bitmap.cpp
+++ b/core/jni/android/graphics/Bitmap.cpp
@@ -872,7 +872,7 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
-static JNINativeMethod gBitmapMethods[] = {
+static const JNINativeMethod gBitmapMethods[] = {
     {   "nativeCreate",             "([IIIIIIZ)Landroid/graphics/Bitmap;",
         (void*)Bitmap_creator },
     {   "nativeCopy",               "(JIZ)Landroid/graphics/Bitmap;",