Add the following tests:
    hiz-stencil-read-fbo-d0-s8.c
    hiz-stencil-read-fbo-d24-s8.c
    hiz-stencil-read-fbo-d24s8.c
    hiz-stencil-read-window-depth0.c
    hiz-stencil-read-window-depth1.c

These tests check that stencil reads work correctly when rendering to
various framebuffer configurations, including FBO's and window
framebuffers.

Signed-off-by: Chad Versace <chad.versace@intel.com>