i965: Bail on the BLT path if BlitFramebuffer requires sRGB conversion.

Modern OpenGL BlitFramebuffer require sRGB encode/decode when
GL_FRAMEBUFFER_SRGB is enabled.  The blitter can't handle this,
so we need to bail.  On Gen4-5, this means falling back to Meta,
which should handle it.

We allow sRGB <-> sRGB blits, as decode then encode ought to be a noop
(other than potential precision loss, which nobody wants anyway).

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

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