gnu: Remove eigen-for-tensorflow.

* gnu/packages/algebra.scm (eigen-for-tensorflow): Delete variable.

Fixes: guix/guix#1856
Change-Id: Ia781c247c7a72b0da42506de15deee11e31972f1

gnu/packages/algebra.scm

@@ -1287,41 +1287,6 @@ features, and more.")
          ((#:tests? tests? #t)
           #f))))))
 
-(define-public eigen-for-tensorflow
-  (let ((changeset "fd6845384b86")
-        (revision "1"))
-    (package (inherit eigen)
-      (name "eigen-for-tensorflow")
-      (version (string-append "3.3.5-" revision "." changeset))
-      (source (origin
-                (method hg-fetch)
-                (uri (hg-reference
-                      (url "https://bitbucket.org/eigen/eigen")
-                      (changeset changeset)))
-                (sha256
-                 (base32
-                  "12cwgah63wqwb66xji048hcxc1z5zjg8a7701zlia5zbilnnk1n5"))
-                (file-name (string-append name "-" version "-checkout"))
-                (modules '((guix build utils)))
-                (snippet
-                 ;; There are 3 test failures in the "unsupported" directory,
-                 ;; but maintainers say it's a known issue and it's unsupported
-                 ;; anyway, so just skip them.
-                 '(begin
-                    (substitute* "unsupported/CMakeLists.txt"
-                      (("add_subdirectory\\(test.*")
-                       "# Do not build the tests for unsupported features.\n"))))))
-      (arguments
-       (substitute-keyword-arguments (package-arguments eigen)
-         ((#:phases phases)
-          `(modify-phases ,phases
-             (delete 'disable-some-tests)
-             ;; This test cannot be compiled
-             (add-after 'unpack 'gcc-compatibility
-               (lambda _
-                 (substitute* "test/CMakeLists.txt"
-                   (("ei_add_test\\(stddeque") "#")))))))))))
-
 (define-public xtensor
   (package
     (name "xtensor")