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Use memfd_create() in Xwayland when available

Link Mauve requested to merge linkmauve/xserver:memfd_create into master

This (so-far) Linux-only API lets users create file descriptors purely in memory, without any backing file on the filesystem and the race condition which could ensue when unlink()ing it.

It also allows seals to be placed on the file, ensuring to every other process that we won’t be allowed to shrink the contents, potentially causing a SIGBUS when they try reading it.

This patch is best viewed with the -w option of git log -p.

This is a port of this commit from Weston: wayland/weston@deae98ef

I also included the unrelated removal of a duplicated #include in the same file, I can put it in another MR if you prefer so.

Fixes #848 (closed).

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