glsl/builtins: Fix ARB_texture_cube_map_array built-in availability.

This patch adds texture() for isamplerCubeArray and usamplerCubeArray,
which were entirely missing.

It also makes texture() with a LOD bias fragment shader specific.  The
main GLSL specification explicitly says that texturing with LOD bias
should not be allowed for vertex shaders.

Affects Piglit's ARB_texture_cube_map_array/compiler/tex_bias-01.vert.
which tries to use bias in a vertex shader.  Currently, it expects this
to pass (so this patch regresses the test), but I've sent a patch to
reverse the expected behavior (so this patch would fix the updated test):
http://lists.freedesktop.org/archives/piglit/2013-June/006123.html

NOTE: This is a candidate for stable branches.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Paul Berry <[email protected]>
Reviewed-by: Dave Airlie <[email protected]>

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