i965: Stop flagging viewport/scissor change on drawbuffers change.
i965: Stop flagging viewport/scissor change on drawbuffers change.

The viewport (ctx->Viewport._WindowMap) doesn't change with drawable size
changes, and we update scissor (ctx->DrawBuffer->_Xmin and friends) on
_NEW_BUFFERS in things like brw_sf_state.c.

Reviewed-by: Anuj Phogat <e2026475996c48f0b97fd37e84129b3912980428@gmail.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

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