Reviewed by: rwatson, bp

Approved by:	rwatson
Obtained from:	NetbSD source tree

Second part of the fsck wrappers commit. This commit enables the new fsck
code (removing the fsck/* code and replacing it with the netbsd fsck
wrapper code), and enabling some FFS-based utilities to compile.

Details:

* quotacheck, fsdb required modification to use the fsck_ffs/ code rather
  than fsck/ . This might change later since quotacheck requires preen.c
  which should exist in fsck/ rather than fsck_ffs/

* src/Makefile has fsck_ffs added to it so it it built as part of the tree
  now

* share/doc/smm/03.fsck/ uses the SMM.doc/ stuff from fsck_ffs, not fsck.

I've tested this, and it shouldn't require any changes on your machine.
The fsck wrapper reads /etc/fsck and is command-line-compatible enough
to not require rc changes (well, most changes unless you want to do
anything nifty by specifying the fs types explicityly, read the man page
if you want further details on what it can do.)

This now allows us to support multiple filesystem types during bootup.

sbin/Makefile

@@ -17,6 +17,7 @@ SUBDIR=	adjkerntz \
 	dumpfs \
 	dumpon \
 	fsck \
+	fsck_ffs \
 	fsdb \
 	fsirand \
 	ifconfig \