gnu: nml: Fix for newer pillow version.

* gnu/packages/game-development.scm (nml)[arguments]: Add a phase to fix
for newer pillow.

gnu/packages/game-development.scm

@@ -314,6 +314,16 @@ (define-public nml
         (base32
          "1pmvvm3sgnpngfa7884mqhq3fwdjh9sr0ca07ypnidcg0y341w53"))))
     (build-system python-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'build 'fix-pillow
+           (lambda _
+             ;; pillow's version is not in PIL.Image.VERSION anymore
+             (substitute* "nml/version_info.py"
+               (("from PIL import Image") "import PIL")
+               (("Image.VERSION") "PIL.__version__"))
+             #t)))))
     (propagated-inputs
      `(("python-pillow" ,python-pillow)
        ("python-ply" ,python-ply)))