Disallow build products that are symlinks

Otherwise you can do

ln -s /etc/passwd $out/foo echo "file misc $out/foo" >> $out/nix-support/hydra-build-products

and get Hydra to serve its /etc/passwd file.

Created by  Eelco Dolstra  on February 23, 2013
IJSJLRZHJXAGSY5MWKQWFU2H6VA2EKS3FUAK3DXW6KGXLO3AMS2QC
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