Change behavior. (require racket-makefile) and use (make <target>) instead of racket Makefile.rkt <target>

tests/engine.rkt

@@ -32,18 +32,18 @@
                         (list (list "result.txt"))
                         void)
 
-      (run-selected-target!)
+      (make-targets!)
       (check-equal? build-count 1)
       (check-true (file-exists? "result.txt"))
 
       ;; Nothing changed, so the file target remains up to date.
-      (run-selected-target!)
+      (make-targets!)
       (check-equal? build-count 1)
 
       ;; Make the input newer than the output and verify that it rebuilds.
       (define result-time (file-or-directory-modify-seconds "result.txt"))
       (file-or-directory-modify-seconds "input.txt" (+ result-time 2))
-      (run-selected-target!)
+      (make-targets!)
       (check-equal? build-count 2)))
   (lambda ()
     (delete-directory/files tmp #:must-exist? #f)))