gnu: Remove r-loomr.

The loomR package is actually non-free software according to its author.  See
https://github.com/mojaveazure/loomR/pull/24.

* gnu/packages/bioinformatics.scm (r-loomr): Remove variable.

gnu/packages/bioinformatics.scm

@@ -13086,35 +13086,6 @@ (define-public r-circus
 can be calculated, and a number of descriptive plots easily generated.")
     (license license:artistic2.0)))
 
-(define-public r-loomr
-  (let ((commit "df0144bd2bbceca6fadef9edc1bbc5ca672d4739")
-        (revision "1"))
-    (package
-      (name "r-loomr")
-      (version (git-version "0.2.0" revision commit))
-      (source
-       (origin
-         (method git-fetch)
-         (uri (git-reference
-               (url "https://github.com/mojaveazure/loomR.git")
-               (commit commit)))
-         (file-name (git-file-name name version))
-         (sha256
-          (base32
-           "1b1g4dlmfdyhn56bz1mkh9ymirri43wiz7rjhs7py3y7bdw1s3yr"))))
-      (build-system r-build-system)
-      (propagated-inputs
-       `(("r-r6" ,r-r6)
-         ("r-hdf5r" ,r-hdf5r)
-         ("r-iterators" ,r-iterators)
-         ("r-itertools" ,r-itertools)
-         ("r-matrix" ,r-matrix)))
-      (home-page "https://github.com/mojaveazure/loomR")
-      (synopsis "R interface for loom files")
-      (description "This package provides an R interface to access, create,
-and modify loom files.  loomR aims to be completely compatible with loompy.")
-      (license license:gpl3))))
-
 (define-public gffread
   ;; We cannot use the tagged release because it is not in sync with gclib.
   ;; See https://github.com/gpertea/gffread/issues/26