WIP: gallium: Derive image from interlaced buffers in certain cases

Thong Thai requested to merge thongthai/mesa:vlc_deriveimage into master

Only allow vaDriveImage to derive and convert interlaced buffers to progressive buffers in some cases (VLC media player) while keeping the existing functionality as a default (for programs such as Kodi)

Closes: #1428 (closed)

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