Which also happens to align the non-Debian specific variables
with the ones used by upstream CMake.

It's pretty much a simplified copy of the Linux script, lacking fancy colors.
Also, I had to drop Python testing, because it's not easy to pass the Python
module location to the script, and I have no pressing need to run the Python
tests at the moment.

1) Fixed deadlock if camera is started and stopped immediately
2) Invalid pattern usage of Object.wait(). Refer to "spurious wakeup": http://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait
3) Fixed buffer usage:
  a) fix eliminates processing of zero NV12 (green in RGB) first frame
  b) latest ready frame is delivered for processing (not previous)

The two functions featuring nNull are not particularly needed, so
I simply removed them.

Because why not?

They don't actually do anything. And even if they did, all components are
enabled by default, anyway.

FFmpeg now requires that frames allocated with avcodec_alloc_frame are
freed with avcodec_free_frame.

The HAVE_DOC_GENERATOR variable was always true.

Absolute destinations are not necessary, and prevent CPack from working.

use `bash` shell instead of `sh`, since on Ubuntu `sh` by default is `dash`,
and `dash` doesn't support `PIPESTATUS` feature used in this sctipt