A kldsym(2) syscall prototype for extracting information from the in-kernel
linker. This is intended to replace kvm_mkdb etc. The first version
only does name->value lookups, but it's open ended. value->name lookups
would probably be a good thing to do too.

It's been suggested to try and connect the symbol tables to sysctl (which
is probably a more flexible way of doing it if it's done right), but that
is far more complex and difficult than I was ready to have a shot at.