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gst: Don't ask for DMA buffers

Jonas Ådahl requested to merge jadahl/pipewire:wip/no-dma-buf-with-gstreamer into master

Gstreamer simply mmap()s the DMA buffers. This can be very very slow on some hardware, so don't ask for it. For gstreamer to support DMA buffers, it will need to support a proper way of transferring the buffers from the GPU to the CPU, e.g. using EGL/OpenGL.

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