gnu: Remove python2-kivy.

* gnu/packages/python-xyz.scm (python2-kivy): Delete variable.

gnu/packages/python-xyz.scm

@@ -18699,9 +18699,6 @@ multitouch applications.")
 Design spec without sacrificing ease of use or application performance.")
     (license license:expat)))
 
-(define-public python2-kivy
-  (package-with-python2 python-kivy))
-
 (define-public python-binaryornot
   (package
     (name "python-binaryornot")