Use MACHINE_CPU instead of MACHINE_ARCH to pick the correct machine dependent

files or directories when applicable.
The inspiration and name of MACHINE_CPU come from NetBSD, although the way to
provide it to Makefiles is completely different.
ok kettenis@

src/lib/libc/crypt/Makefile.inc

@@ -1,6 +1,6 @@
-#	$OpenBSD: Makefile.inc,v 1.16 2008/03/16 22:08:12 deraadt Exp $
+#	$OpenBSD: Makefile.inc,v 1.17 2010/02/03 20:49:00 miod Exp $
 
-.PATH: ${LIBCSRCDIR}/arch/${MACHINE_ARCH}/crypt ${LIBCSRCDIR}/crypt
+.PATH: ${LIBCSRCDIR}/arch/${MACHINE_CPU}/crypt ${LIBCSRCDIR}/crypt
 
 SRCS+=	cast.c crypt.c crypt2.c md5crypt.c arc4random.c blowfish.c
 SRCS+=  bcrypt.c skipjack.c

src/lib/libc/stdlib/Makefile.inc

@@ -1,7 +1,7 @@
-#	$OpenBSD: Makefile.inc,v 1.42 2009/06/03 15:52:16 millert Exp $
+#	$OpenBSD: Makefile.inc,v 1.43 2010/02/03 20:49:00 miod Exp $
 
 # stdlib sources
-.PATH: ${LIBCSRCDIR}/arch/${MACHINE_ARCH}/stdlib ${LIBCSRCDIR}/stdlib
+.PATH: ${LIBCSRCDIR}/arch/${MACHINE_CPU}/stdlib ${LIBCSRCDIR}/stdlib
 
 SRCS+=	a64l.c abort.c atexit.c atoi.c atof.c atol.c atoll.c bsearch.c \
 	cfree.c exit.c ecvt.c gcvt.c getenv.c getopt_long.c \
@@ -12,28 +12,28 @@ SRCS+=	a64l.c abort.c atexit.c atoi.c atof.c atol.c atoll.c bsearch.c \
 	tfind.c tsearch.c _rand48.c drand48.c erand48.c jrand48.c lcong48.c \
 	lrand48.c mrand48.c nrand48.c seed48.c srand48.c qabs.c qdiv.c _Exit.c
 
-.if   (${MACHINE_ARCH} == "m68k")
+.if   (${MACHINE_CPU} == "m68k")
 SRCS+=	abs.S div.c labs.c ldiv.c
 LSRCS+=	abs.c
-.elif (${MACHINE_ARCH} == "i386")
+.elif (${MACHINE_CPU} == "i386")
 SRCS+=	abs.S div.S labs.S ldiv.S
 LSRCS+=	abs.c div.c labs.c ldiv.c
-.elif (${MACHINE_ARCH} == "ns32k")
+.elif (${MACHINE_CPU} == "ns32k")
 SRCS+=	abs.S div.c labs.c ldiv.c
 LSRCS+=	abs.c
-.elif (${MACHINE_ARCH} == "tahoe")
+.elif (${MACHINE_CPU} == "tahoe")
 SRCS+=	abs.S div.c labs.c ldiv.c
 LSRCS+=	abs.c
-.elif (${MACHINE_ARCH} == "vax")
+.elif (${MACHINE_CPU} == "vax")
 SRCS+=	abs.c div.c labs.c ldiv.c
-.elif (${MACHINE_ARCH} == "alpha")
+.elif (${MACHINE_CPU} == "alpha")
 # XXX should be .S's
 SRCS+=	abs.c div.c labs.c ldiv.c
 .else
 SRCS+=	abs.c div.c labs.c ldiv.c
 .endif
 
-.if (${MACHINE_ARCH} == "vax") || (${MACHINE_ARCH} == "m68k")
+.if (${MACHINE_CPU} == "vax") || (${MACHINE_CPU} == "m68k")
 SRCS+=	insque.S remque.S
 .else
 SRCS+=	insque.c remque.c

src/lib/libc/string/Makefile.inc

@@ -1,7 +1,7 @@
-#	$OpenBSD: Makefile.inc,v 1.20 2007/10/25 22:41:02 miod Exp $
+#	$OpenBSD: Makefile.inc,v 1.21 2010/02/03 20:49:00 miod Exp $
 
 # string sources
-.PATH: ${LIBCSRCDIR}/arch/${MACHINE_ARCH}/string ${LIBCSRCDIR}/string
+.PATH: ${LIBCSRCDIR}/arch/${MACHINE_CPU}/string ${LIBCSRCDIR}/string
 
 SRCS+=	bm.c memccpy.c memrchr.c strcasecmp.c strcasestr.c strcoll.c strdup.c \
 	strerror.c strerror_r.c strlcat.c strmode.c strsignal.c strtok.c \
@@ -20,7 +20,7 @@ SRCS+=	bm.c memccpy.c memrchr.c strcasecmp.c strcasestr.c strcoll.c strdup.c \
 # m-d Makefile.inc may include sources for:
 #	memcpy() memmove() strchr() strrchr()
 
-.include "${LIBCSRCDIR}/arch/${MACHINE_ARCH}/string/Makefile.inc"
+.include "${LIBCSRCDIR}/arch/${MACHINE_CPU}/string/Makefile.inc"
 
 # if no machine specific memmove(3), build one out of bcopy(3).
 .if empty(SRCS:Mmemmove.S)