bug#74836: reconfigure fails with colord-service-type enabled

[Nathan Dehnel]

guix a9003b8

$ gunzip -c 
/var/log/guix/drvs/9q/shqzfg9m1xq3vqkkim048jfn67q4zz-dbus-system-services.drv.gz
find-files: /gnu/store/lhz771ckxyxydd5va71jxj2fl7xz8gls-gdm-44.1/share/dbus-1/:
No such file or directory
Backtrace:
           3 (primitive-load "/gnu/store/57whwdicsj7gqjchrwi6lmkikz6?")
In ice-9/eval.scm:
    619:8  2 (_ #f)
In srfi/srfi-1.scm:
    634:9  1 (for-each #<procedure 7ffff7824660 at ice-9/eval.scm:3?> ?)
In unknown file:
           0 (symlink "/gnu/store/ggaj14rcnab55ic690f5vabj0m6ydpb4-?" ?)

ERROR: In procedure symlink:
In procedure symlink: File exists