Changes

Add missing privileged section for NativeLibrary lookup: GLContextImpl and FFMPEGDynamicLibraryBundleInfo

Since GlueGen security fix commit 12feaa7d3b1544098f684d851e3caff1ec88cbc8
and its cleanup dd2440cbadc642a561d8f92c502fe822b2f11762
the GLContextImpl func lookup caused a security exception.

Applied fix to FFMPEGDynamicLibraryBundleInfo as well.

Fix FFMPEGMediaPlayer: static init block issue, libavresample debian8 packaging

- static init block issue
  commit 06a05d30fc026b21f59310986ea9eb7f3ff30d54
  used a static final field initialized after the static {} block
  which was still null if called -> moved above static {}

- libavresample debian8 packaging
  Debian8 packages a libav10 combination w/ libavresample version 2,
  which actually belongs to libav11 - libav10 uses libarvresample version 1.
  Allow libavresample and libswresample to be selectively skipped if version mismatch.