Fix 965+ rendering issues with DRI disabled.

The new chips no longer automatically flush the rendering cache, so if we
don't flush the RC at blockhandler, the last rendering done may not
appear on the screen.  This was particularly noticable with a bare Xorg with
some missing root weave, and terminals where the last character wouldn't
appear until the cursor blinked.  A flush in the DRI blockhandler path had
hidden this issue for most people.

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