sys-kernel/genkernel-next-68: --kerncache zaps /lib symlink

[tlhonmey]

genkernel-next 68
Kernel sources removed from system

genkernel --no-clean --kerncache= --no-kernel-sources initramfs

deletes the /lib symlink to /lib64 and replaces it with a directory, into which it unpacks the modules cache from the kernel cachefile.

Building the initramfs then fails because the udev rules and other goodies it wants out of /lib are gone.

https://bugs.gentoo.org/667502

Gentoo bug has a suggestion from Ben Kohler about how to fix it that may or may not be easily portable.