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[ar] Separate the not standard part to a different file

We already have a DRIVER variable that indicate the host
system where we want to run, so it is a good idea to reuse
the same variable here.

diff: cannot open b/ar/posix//null: file does not exist: 'b/ar/posix//null'

--- a/ar/Makefile

+++ b/ar/Makefile

@@ -1,8 +1,16 @@

+.POSIX:

+include ../config.mk

+

+OBJ = ar.o $(DRIVER/stat.c

+MOREFLAGS=-I$(DRIVER)

+

 all: ar

+ar.o: $(DRIVER)/stat.h

+

 dep:

 clean:

-	rm -f ar

+	rm -f ar *.o $(DRIVER)/*.o

 distclean: clean

--- a/ar/ar.c

+++ b/ar/ar.c

@@ -1,12 +1,10 @@

-#include <sys/types.h>

-#include <sys/stat.h>

-#include <unistd.h>

-

 #include <errno.h>

 #include <stdio.h>

 #include <stdlib.h>

 #include <string.h>

+

+#include <stat.h>

 int

 main(int argc, char *argv[])

--- /dev/null

+++ b/ar/posix/stat.c

@@ -1,0 +1,3 @@

+static char sccsid[] = "@(#) ./ar/stat.c";

+

+#include "stat.h"

--- /dev/null

+++ b/ar/posix/stat.h

@@ -1,0 +1,5 @@

+

+#include <sys/types.h>

+#include <sys/stat.h>

+#include <unistd.h>

+