constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/android_os_SystemProperties.cpp b/core/jni/android_os_SystemProperties.cpp
index 554d304..5dace6b 100644
--- a/core/jni/android_os_SystemProperties.cpp
+++ b/core/jni/android_os_SystemProperties.cpp
@@ -220,7 +220,7 @@
     }
 }
 
-static JNINativeMethod method_table[] = {
+static const JNINativeMethod method_table[] = {
     { "native_get", "(Ljava/lang/String;)Ljava/lang/String;",
       (void*) SystemProperties_getS },
     { "native_get", "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;",