constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/com_android_internal_util_VirtualRefBasePtr.cpp b/core/jni/com_android_internal_util_VirtualRefBasePtr.cpp
index 7a18c2d..d20bae2 100644
--- a/core/jni/com_android_internal_util_VirtualRefBasePtr.cpp
+++ b/core/jni/com_android_internal_util_VirtualRefBasePtr.cpp
@@ -36,7 +36,7 @@
 
 const char* const kClassPathName = "com/android/internal/util/VirtualRefBasePtr";
 
-static JNINativeMethod gMethods[] = {
+static const JNINativeMethod gMethods[] = {
     { "nIncStrong", "(J)V", (void*) incStrong },
     { "nDecStrong", "(J)V", (void*) decStrong },
 };