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backend/headless: add WLR_HEADLESS_DEVICE env variable

Simon Ser requested to merge github/fork/emersion/headless-env into master

This lets users select the DRM node to use for rendering.

It would be nice to have a generalized env variable to select the rendering device regardless of the backend. However this would break the DRM backend, which expects buffers coming from the primary device.

Edited by Simon Ser

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