gnu: r-mvtnorm: Move to (gnu packages cran).

* gnu/packages/statistics.scm (r-mvtnorm): Move from here...
* gnu/packages/cran.scm (r-mvtnorm): ...to here.

Change-Id: I57f6b08ad9d6f66a3233accd7521017424f21a96

gnu/packages/statistics.scm

@@ -2029,25 +2029,6 @@ things.  RSP is ideal for self-contained scientific reports and R package
 vignettes.")
     (license license:lgpl2.1+)))
 
-(define-public r-mvtnorm
-  (package
-    (name "r-mvtnorm")
-    (version "1.3-3")
-    (source (origin
-              (method url-fetch)
-              (uri (cran-uri "mvtnorm" version))
-              (sha256
-               (base32
-                "0wa1zal0q8zawqrjllx70kakn3ynpsm0imb3mmc956y89d9py3p2"))))
-    (build-system r-build-system)
-    (native-inputs
-     (list gfortran r-numderiv))
-    (home-page "https://mvtnorm.R-forge.R-project.org")
-    (synopsis "Package for multivariate normal and t-distributions")
-    (description "This package can compute multivariate normal and
-t-probabilities, quantiles, random deviates and densities.")
-    (license license:gpl2)))
-
 (define-public r-tidyselect
   (package
     (name "r-tidyselect")