Bug 567 (part 2): add support for openal extensions
Alter the OpenAL-soft headers to please the gluegen parser.
al-types.h and alc-types.h imported from the patch made by Michael Zucchi.

Author: Michael Zucchi <notzed@gmail.com>
Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
Remove obstolete bundled OpenAL and OpenAL-soft binarys.
Prefer system installed libraries or
OpenAL-soft built from source.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>
Re-import OpenAL stub_includes/openal/eax.h required for EAX.
It is still questionable if we want to support EAX
drivers for EAX only exist before Windows Vista.
Many JOAL applications expect the EAX detection code to exist.

Signed-off-by: Xerxes Rånby <xerxes@zafena.se>