-current kernel headers vs. MS VC compiler

Folks:
	It looks like changes to the kernel headers over the last couple of 
months have broken the ability to build things that rely on libsa, etc. 
with compilers other than GCC & PCC.  Specifically, I can no longer 
build hpcboot.exe with MS eMbedded Visual C++ 4.0 after upgrading my 
kernel tree to the head of trunk.

	The first change that bit me was a change from the old 
'__attribute__((packed))', which used to be defined away on non-GCC 
compilers (probably incorrectly, but nonetheless) to using '__packed', 
in sys/ufs/ffs/fs.h:

	RCS file: /cvsroot/src/sys/ufs/ffs/fs.h,v
	Working file: fs.h
	head: 1.49
	----------------------------
	revision 1.49
	date: 2007/12/25 18:33:49;  author: perry;  state: Exp;  lines: +2 -2
	Convert many of the uses of __attribute__ to equivalent
	__packed, __unused and __dead macros from cdefs.h

I've 'fixed' this with the following change, because I don't know how to 
make the MS compiler #pragma pack fit into the syntax we require (nor 
was I able to find an MS compiler extension which looked it it might help):

Index: cdefs.h
===================================================================
RCS file: /cvsroot/src/sys/sys/cdefs.h,v
retrieving revision 1.66
diff -u -p -r1.66 cdefs.h