intel: Always enable GL_ARB_framebuffer_object
intel: Always enable GL_ARB_framebuffer_object

Now that _mesa_BindFramebuffer does the right thing in ES contexts when the
gl_extensions::ARB_framebuffer_object bit is set, the Intel driver doesn't
need this hack.

No piglit or GLES2 conformance regressions observed on IVB, and this
patch (and the previous) fix es3conform's framebuffer_srgb_draw and
transform_feedback_misc tests.

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Chad Versace <a557f7f75bf28dc19ac99107f5cc7cd6b3fbdb1a@linux.intel.com>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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