With the following changes:
- inet6: Fix default route not being installed
- DHCP: If root fs is network mounted, enable last lease extend
- man: Fix lint errors.
- BSD: avoid RTF_WASCLONED routes
- DHCP: Give a better message when packet validation fails
- DHCP: Ensure we have enough data to checksum IP and UDP
The last change fixes a potential DoS attack introduced in dhcpcd-8.0.3 when the checksuming code was changed to accomodate variable length IP headers. The commit says since 7.2.0, but I've now decided that's not the case.