What to do?
Problem: nothing provides kernel-devel = 4.16.1-1 needed by kernel-default-devel-4.16.1-1.6.x86_64
Solution 1: deinstallation of kernel-default-devel-4.16.0-1.6.x86_64
Solution 2: install kernel-default-devel-4.16.2-1.5.i586 despite the inferior architecture
Solution 3: keep obsolete kernel-default-devel-4.16.0-1.6.x86_64
Solution 4: break kernel-default-devel-4.16.1-1.6.x86_64 by ignoring some of its dependencies