Add sample "san-angeles" program to demo OpenGL ES from native code.

Note that the app will only build against an android-4 SDK.
(Interestingly, the resulting binary runs very well under android-3).

This also adds missing license headers to the 'two-libs' sample.

ndk/sources/samples/two-libs/second.c

@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
 #include "first.h"
 #include <jni.h>