put an mi wrapper around stdarg.h/varargs.h. gcc3 moved stdarg/varargs macros

to built-ins, so eventually we will have one version of these files.
Special adjustments for the kernel to cope: machine/stdarg.h -> sys/stdarg.h
and machine/ansi.h needs to have a _BSD_VA_LIST_ for syslog* prototypes.
okay millert@, drahn@, miod@.

src/include/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.121 2003/07/21 21:13:18 millert Exp $
+#	$OpenBSD: Makefile,v 1.122 2004/01/03 14:08:52 espie Exp $
 #	$NetBSD: Makefile,v 1.59 1996/05/15 21:36:43 jtc Exp $
 
 #	@(#)Makefile	5.45.1.1 (Berkeley) 5/6/91
@@ -26,8 +26,8 @@ FILES+=	link.h link_aout.h link_elf.h
 FILES+= ieeefp.h
 .endif
 
-MFILES=	float.h frame.h stdarg.h varargs.h
-LFILES=	errno.h fcntl.h syslog.h termios.h
+MFILES=	float.h frame.h 
+LFILES=	errno.h fcntl.h syslog.h termios.h stdarg.h varargs.h
 
 DIRS=	arpa protocols rpc rpcsvc
 LDIRS=	crypto ddb dev isofs miscfs net netatalk netccitt netinet altq \