mesa: Add new scissor entry points for GL_ARB_viewport_array

v2 (idr): Use set_scissor_no_notify (and manually notify the driver)
instead of calling _mesa_set_scissori.  Refactory bodies of
_mesa_ScissorIndexed and _mesa_ScissorIndexedv into a shared function.
Perform parameter validation in the same order in all three functions.
Pull MaxViewports comparison fix (in _mesa_ScissorArrayv) from the next
patch to this patch.

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

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