Bug#883410: linux-image-4.14.0-1-amd64: Enable zstd support for SquashFS in 4.14

[Norbert Lange]

I second this wish,

and would further ask to enable CONFIG_SQUASHFS_FILE_DIRECT, as this
will improve performance.
The "downside" would be that with a bottleneck removed, more IO can
then mean more CPU Resources are used by the kernel (though I don't
see that a downside, just means some threads using IO are finished
earlier, performance still is up). see
https://lkml.org/lkml/2017/9/22/814