Resolve "fix package set problem"

Related to #22 (closed)

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Hopefully this is our final iteration: Removal of krb5-devel for CVE-2020-17049, causes dnf to also remove required runtime dependencies for xmlsec; xmlsec-1-devel and xmlsec1-openssl-devel; which breaks our app, so I will need to re-add this package, and more closely scrutinize the build log for other issues.

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