fix appveyor build for linux x86

Created by: q4a

Appveyor has built-in ppa-s with unstable version of libllvm10 and got error like:

libllvm10 : Breaks: libllvm10:i386 (!= 1:10.0.1~++20200708123507+ef32c611aa2-1~exp1~20200707224105.191) but 1:10.0.0-4ubuntu1~18.04.1 is to be installed libllvm10:i386 : Breaks: libllvm10 (!= 1:10.0.0-4ubuntu1~18.04.1) but 1:10.0.1~++20200708123507+ef32c611aa2-1~exp1~20200707224105.191 is to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages

https://ci.appveyor.com/project/q4a/xray-16/builds/34132126/job/yvl3g9b99gthl0p0#L580

So, I just fixed it with with manual installation working version 1:10.0.0-4ubuntu1~18.04.1