* bucomm.h (make_tempdir): Declare independently of HAVE_MKDTEMP.

	* bucomm.h (make_tempdir): Declare independently of HAVE_MKDTEMP.
	* bucomm.c (template_in_dir): New function, split out from..
	(make_tempname): ..here.  Open the file with O_EXCL if !HAVE_MKSTEMP.
	(make_tempdir): Use template_in_dir.  Handle directory creation
	when !HAVE_MKDTEMP.
	* objcopy.c (MKDIR): Don't define.
	(copy_archive): Use make_tempdir when !HAVE_MKDTEMP too.  Fix
	error message.