mesa: Revert INTEL_fragment_shader_ordering support

mesa: Revert INTEL_fragment_shader_ordering support

This extension is not properly tested (testing for
GL_ARB_fragment_shader_interlock is not sufficient), and since this was
noted in review on August 28th no tests have been sent.

Revert "i965: Add INTEL_fragment_shader_ordering support."
Revert "mesa: Add GL/GLSL plumbing for INTEL_fragment_shader_ordering"

This reverts commit 03ecec9ed2099f6e2b62994b33dc948dc731e7b8.
This reverts commit 119435c8778dd26cb7c8bcde9f04b3982239fe60.

Cc: mesa-stable@lists.freedesktop.org
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Eric Anholt <eric@anholt.net>
(cherry picked from commit 017199d2d2e4c57015bc60edfcc656062c3a7472)