constify generated JNINativeMethod fn ptr tables

Change-Id: Icbad34e298f6d8e60ef12e9a91200994249fe2f5
diff --git a/opengl/tools/glgen/src/JniCodeEmitter.java b/opengl/tools/glgen/src/JniCodeEmitter.java
index 1bed05b..5a412bf 100644
--- a/opengl/tools/glgen/src/JniCodeEmitter.java
+++ b/opengl/tools/glgen/src/JniCodeEmitter.java
@@ -673,7 +673,7 @@
                         "\";");
         cStream.println();
 
-        cStream.println("static JNINativeMethod methods[] = {");
+        cStream.println("static const JNINativeMethod methods[] = {");
 
         cStream.println("{\"_nativeClassInit\", \"()V\", (void*)nativeClassInit },");