swrast: Use fixed-function processing instead _TexEnvProgram for DrawPixels

This is a hack to work around drivers such as i965 that:

    - Set _MaintainTexEnvProgram to generate GLSL IR for
      fixed-function fragment processing.
    - Don't call _mesa_ir_link_shader to generate Mesa IR from the
      GLSL IR.
    - May use swrast to handle glDrawPixels.

Since _mesa_ir_link_shader is never called, there is no Mesa IR to
execute.  Instead do regular fixed-function processing.

Even on platforms that don't need this, the software fixed-function
code is much faster than the software shader code.

NOTE: This is a candidate for the 8.0 branch.

Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Eric Anholt <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=44749

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