complete-path repair for raco make

Fix problem with 4e3a7c4 as exposed by the "make.rkt" test in
the "compiler-test" package.

racket/collects/setup/parallel-build.rkt

@@ -250,7 +250,7 @@
            (define-values (dir file b) (split-path hd))
            (set! filelist tail)
            (handler workerid 'start hd "" "" "")
-           (values hd (list (->bytes hd) (->bytes hd) null))]))
+           (values hd (list (->bytes hd) (->bytes (path->complete-path hd)) null))]))
 
       (define/public (has-jobs?) (not (null? filelist)))
       (define/public (jobs-cnt) (length filelist))