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Client: Add F_SEAL_SHRINK seal to shm backing file

This lets libwayland-server avoid installing a SIGBUS handler when it wants to mmap() the backing file and access the contents of shared memory client buffers.

Change-Id: Id0b17f729799535d73e8700c5a99c32fd88a068a Reviewed-by: Qt CI Bot Reviewed-by: David Edmundson (cherry picked from commit 0c1cbb37)

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