vrend: Don't crash when no feat_dual_src_blend
When there is no feat_dual_src_blend, avoid calling glBindFragDataLocationIndexed. Otherwise epoxy could crash the whole process when this function is not available. Signed-off-by:Lepton Wu <lepton@chromium.org> Reviewed-by:
Gurchetan Singh <gurchetansingh@chromium.org>
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