julia.withPackages: Disable pretty terminal output during nix build

Prior to this patch, julia would log output destined for a terminal
which can support cursor movements, which we don't have while building
under nix.

The only way I could find to turn this off is to set CI=true during
precompilation, which substantially reduces the amount of log output you
end up with, to only the salient output (one line per package, instead
of many identical lines being printed).

Signed-off-by: Peter Waller <p@pwaller.net>

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