util: Fix Debian version detection in validate_cross_platform()

Michal Prívozníkrequested to merge
MichalPrivoznik/libvirt-ci:debian_sid_fix into master

Not all Debian versions are numbers, there's also "Sid". Trying to convert the string into an integer (using int() method) leads to an exception. Well, skip Sid over.

Fixes: 409862fc Fixes: c7a03f45 Signed-off-by: Michal Privoznik mprivozn@redhat.com

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