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wayland: Use shm_open(SHM_ANON) on FreeBSD

Val Packett requested to merge valpackett/gtk:patch-1 into gtk-3-24

This functionality is similar to Linux's memfd. It creates anonymous shared memory without touching the filesystem, which allows it to work in Capsicum capability mode (sandbox).

It's been available for a long time, so there's no need for smarter detection as with memfd.

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