constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/AndroidRuntime.cpp b/core/jni/AndroidRuntime.cpp
index 1cbbeff..3fc001b 100644
--- a/core/jni/AndroidRuntime.cpp
+++ b/core/jni/AndroidRuntime.cpp
@@ -214,7 +214,7 @@
 /*
  * JNI registration.
  */
-static JNINativeMethod gMethods[] = {
+static const JNINativeMethod gMethods[] = {
     { "nativeFinishInit", "()V",
         (void*) com_android_internal_os_RuntimeInit_nativeFinishInit },
     { "nativeZygoteInit", "()V",