Fix "projects[drupal] is not allowed in a regular drupal-org.make file." error when using `drush verify-makefile`

Title says it all.

I thought I'd fixed it by doing this in build-spark.make:

-; Include the definition for how to build Drupal core directly, including patches:
-includes[] = drupal-org-core.make

But apparently I just broke it worse:

wim.leers at wimleers-acquia in ~/Work/spark on 7.x-1.x*
$ drush make build-spark.make temp-spark-directory
No core project specified.