Remove duplicate OPTION_PAGE_FLIP entry

Reported by 'amanual' on IRC
radeon/vdpau: don't report VDPAU for < r300

Signed-off-by: David Heidelberger <david.heidelberger@ixit.cz>
glamor: enable DRI3

Signed-off-by: David Heidelberger <david.heidelberger@ixit.cz>
radeon/dri3: support DRI3 with EXA acceleration

Signed-off-by: David Heidelberger <david.heidelberger@ixit.cz>
Signed-off-by: Axel Davy <axel.davy@ens.fr>