Kovid Goyal ac98b85157 Wayland: Use memfd_create() and seals if available ...

This allows the compositor to avoid having to setup and teardown a
SIGBUS signal handler whenever it needs to read from this surface, as it
knows we won’t be able to shrink the file and so doesn’t have to protect
against that.

Only enabled on Linux, since only Linux has memfd_create()

2018-10-03 09:47:04 +05:30

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