KERN_PROC_CWD in sysctl(3)
That is kern.proc.$$.KERN_PROC_CWD (I think - not that it matters here)
The effect is that -lrump now requires -lrumpvfs
This set of changes fixes (I believe) regular dynamic builds,
more might be required for static builds (will be verified soon).
instead of it being always provided by the rump kernel base. This
move accomplishes two things:
1) it is no longer necessary to provide sysproxy hypercall stubs for
platforms which do not want to use sysproxy
2) it is easier to reason about the security aspects, since configurations
not linking the sysproxy component simply do not support remote
system calls
discussed on rumpkernel-users