Revert the checks about RTF_LOCAL routes.

Revert the checks about RTF_LOCAL routes.

Even if in the end we would like to be more strict about what userland
can do with kernel-managed route entries, most of the tools out there
are not yet ready for this.  Since RTF_LOCAL routes are for the moment
just like RTF_LLINFO routes without expire timer, allow userland tools
to remove/modify them.  In case they are missing, the good old cloning
mechanism will recreate what you need.

bluhm@ and deraadt@ agree.