Sight does not build reproducibly any more

Hi Flavien,

I considered an easy task to solve

  s/libogre-1.12-dev/libogre-14-dev/ (bug #1138262)

which would probably been possible even with the previous version.
Unfortunately we did run into a reproducibly issue with version 26.0.0
and this became a thing now in Debian since it is requried that packages
that once builded reproducibly have to keep this feauture.  I admit I'm
not sufficiently experienced - but here is the log claiming its not
reproducible:

  https://reproduce.debian.net/amd64/api/v1/builds/260073/artifacts/669451/diffoscope

Can you have a look into this?

Kind regards
    Andreas.