mesa: GL_TEXTURE_BORDER_COLOR exists in OpenGL 1.0, so don't depend on GL_ARB_texture...

mesa: GL_TEXTURE_BORDER_COLOR exists in OpenGL 1.0, so don't depend on GL_ARB_texture_border_clamp

On NV20 (and probably also on earlier NV GPUs that lack
GL_ARB_texture_border_clamp) fixes the following piglit tests:

    gl-1.0-beginend-coverage gltexparameter[if]{v,}
    push-pop-texture-state
    texwrap 1d
    texwrap 1d proj
    texwrap 2d proj
    texwrap formats

All told, 49 more tests pass on NV20 (10de:0201).

No changes on Intel CI run or RV250 (1002:4c66).

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>