Sight does not build on i386

[Andreas Tille <andreas@an3as.eu>]

Hi Flavien,

I wanted to do a source-only upload of sight but I realised it does not
build on i386[1].  I'm not sure whether you intend to support i386 but
if not this should be explicitly declared as amd64 only.

Kind regards

     Andreas.

[1] https://buildd.debian.org/status/fetch.php?pkg=sight&arch=i386&ver=21.0.0-1&stamp=1635274833&raw=0

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