tests-3d: add mipmap test
tests-3d: add cubemap test
fdre-a3xx: realign w/ mesa ir-a3xx code
tests-3d: add tests based on two piglit tests

Add tests based on two piglit tests, one which causes gpu lockup and the
other which doesn't.
tests-3d/mipmap: add different filter modes
tests-3d: add alpha-test enable/disable..
tests-3d: add glFrontFace() to triangle-smoothed
update envytools