linux_dmabuf_v1: Use wlr_drm_format_set_union
It's a little bit awkward that you can't send in dst as one of the inputs because we require dst to be uninitialized. format_set_{union, intersect} should be changed to be closer to pixman.
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It's a little bit awkward that you can't send in dst as one of the inputs because we require dst to be uninitialized. format_set_{union, intersect} should be changed to be closer to pixman.