Added tests for the linear hook APIs

Add rumpkern_nv (in-kernel RUMP libnv).

branches: 1.12.16; 1.12.18;
Always descend into component directories for rumpdescribe.

Move sysproxy support into a separate component, rumpkern_sysproxy,
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

branches: 1.10.6;
Put nanosleep() and folks in librump instead of maintaining them in
the separate rumpkern_time component. Keeping time-related routines
elsewhere lead to some illogical behavior if you didn't think of linking
in rumpkern_time (hands up everyone who checks the return value of
nanosleep()).

Add warnings if rumpkern_time is linked or used. I'll remove it in a
month or two instead of now since it was part of a buildrump.sh snapshot
and it's nicer if trying to use it gives a warning instead of an error
in the next snapshot.

"everything should be as modular as possible, but no more modular than that"

Add rumpkern_time for nanosleep, clock_gettime, setitimer, etc.

Build and install sljit and bpfjit rump components iff ${MKSLJIT} != "no".

sljit is only available on very few architectures, so do not try to build
it on all.

Build rumpkern_sljit and rumpnet_bpfjit; include them into the sets.

branches: 1.5.2; 1.5.4;
P1003_1B_SEMAPHORE is no longer optional.

branches: 1.4.2; 1.4.6; 1.4.10;
Fix spelling of MKZFS

branches: 1.3.2;
Add support for compiling ZFS and Solaris modules as RUMP libraries. Add
some locking and rumpcopy primitives and refactor module building Makefiles
to work with both RUMP and kernel modules. This is first part of adding
support for regular test of zfs on NetBSD to hunt some bugs and make it
stable.

Ok by pooka@.

branches: 1.2.2;
rumpcrypto should never have been its own faction, so finally make
it a component under kern, i.e. rumpcrypto -> rumpkern_crypto.

Make build similar to fs, net & dev.