Fix libkrun build and dependencies

[yselkowitz]

libkrun is being added per minimization/content-resolver-input#1554 but the ELN build needs to be fixed (vendored tarball was not uploaded) and its dependencies limited (libkrunfw and virglrenderer are unwanted, per comments there).

[yselkowitz]

https://src.fedoraproject.org/rpms/libkrun/pull-request/3

[yselkowitz]

https://koji.fedoraproject.org/koji/buildinfo?buildID=2965538