TAKE - first pass at xfs_copy

[Rusell Cattelan <cattelan@rose.americas.sgi.com>]

Started messing with this the other night.
I've tested this on a small FS dumping to a file and then mounting
it back on a loop device, and everything seems to work.
I have not tested multiple targets so I don't know if the thread code 
is working totally.
There may be some endian conversion issues yet.


Date:  Thu Dec 12 16:59:14 PST 2002
Workarea:  rose.americas.sgi.com:/misc/xfs2/XFS/x2.4-xfs-devel

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/slinx/2.4.x-xfs


Modid:  xfs-cmds:slinx:135102a
cmd/xfsdump/copy/xfs_copy.c - 1.7
	- Convert to us*sema to pthread*
	  Endian convert the nessesary values

cmd/xfsdump/copy/locks.h - 1.6
	- Convert to us*sema to pthread*

cmd/xfsdump/copy/locks.c - 1.5
	- Convert to us*sema to pthread*

cmd/xfsdump/copy/Makefile - 1.8
	- Pull in lib pthread and libxfs headers