Changes

Adapt to GlueGen commit c3054a01990e55ab35756ea23ab7d7c05f24dd37 (compount call-by-value extension), utilizing native JVMUtil_NewDirectByteBufferCopy(..)

Fix regression due to GlueGen commit c3054a01990e55ab35756ea23ab7d7c05f24dd37, completes JOGL commit 68ca3ae8fcce28c62034299bc6e6f7eaab50bd1f

Add handling of 'initializeImpl()' of generated GLU* classes:
  - GLU      : no 'initializeImpl()' <- no libs
  - GLUgl2es1: no 'initializeImpl()' <- no libs
  - GLUgl:     call 'initializeImpl()' in manual static init impl.

Further more, we shall not initialize the GLU* classes in GLU
static init method, querying GLU* class availability.

Tested via OlympicES1.

Adapt to GlueGen commit 2f6586292cd298bbc19d8acda0f7cf303c82078b (compount call-by-value extension)

- GLU*: initializeImpl() is no more required, since it's not forced .. uncomment in manual static initializer
- GLX: 'ForceStaticInitCode GLX', i.e. forcing native code, as used in our manual implementation.