gnu: Remove combinatorial-designs.

The package would only be useful for sage; but with commit
f83fabf2f6717d0323be95f3e300dc570d170bdc of sage, its content has been
moved into a file internal to the sage distribution.

* gnu/packages/sagemath.scm (combinatorial-designs): Delete variable.

Change-Id: Id690cd9524306a4ea98d745c6e997573b9bf867f

gnu/packages/sagemath.scm

@@ -351,31 +351,3 @@ to be used by SageMath.")
 database.")
     ;; Debian says GPLv2+.
     (license license:gpl2+)))
-
-(define-public combinatorial-designs
-  (package
-    (name "combinatorial-designs")
-    (version "20140630")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append
-                    "https://mirrors.mit.edu/sage/spkg/upstream/"
-                    "combinatorial_designs/combinatorial_designs-"
-                    version ".tar.bz2"))
-              (sha256
-               (base32
-                "0bj8ngiq59hipa6izi6g5ph5akmy4cbk0vlsb0wa67f7grnnqj69"))))
-    (build-system copy-build-system)
-    (arguments
-     '(#:install-plan '(("." "share/combinatorial_designs/"))))
-    (home-page "https://www.sagemath.org")
-    (synopsis "Data for Combinatorial Designs")
-    (description
-     "This package contains data for combinatorial designs.  It
-currently contains:
-
-@itemize
-@item The table of @acronym{MOLS, Mutually orthogonal Latin squares} from the
-Handbook of Combinatorial Designs, 2nd edition.
-@end itemize")
-    (license license:public-domain)))