gnu: mpi.scm: Use 'license:' prefix.

* gnu/packages/mpi.scm: Import (guix licenses) with the 'license:'
prefix.

gnu/packages/mpi.scm

@@ -26,8 +26,7 @@
 
 (define-module (gnu packages mpi)
   #:use-module (guix packages)
-  #:use-module ((guix licenses)
-                #:hide (expat zlib))
+  #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix download)
   #:use-module (guix utils)
   #:use-module (guix deprecation)
@@ -130,7 +129,7 @@ (define-public hwloc-1
 hwloc may display the topology in multiple convenient formats.  It also offers
 a powerful programming interface to gather information about the hardware,
 bind processes, and much more.")
-    (license bsd-3)))
+    (license license:bsd-3)))
 
 (define-public hwloc-2
   ;; Note: 2.0 isn't the default yet, see above.
@@ -275,7 +274,7 @@ (define-public openmpi
 best MPI library available.  Open MPI offers advantages for system and
 software vendors, application developers and computer science researchers.")
     ;; See file://LICENSE
-    (license bsd-2)))
+    (license license:bsd-2)))
 
 ;; TODO: javadoc files contain timestamps.
 (define-public java-openmpi
@@ -394,7 +393,7 @@ (define-public python-mpi4py
 supports point-to-point and collective communications of any picklable Python
 object as well as optimized communications of Python objects (such as NumPy
 arrays) that expose a buffer interface.")
-    (license bsd-3)))
+    (license license:bsd-3)))
 
 (define-public mpich
   (package
@@ -471,4 +470,4 @@ (define-public mpich
 Gigabit Ethernet, InfiniBand, Myrinet, Quadrics), and proprietary high-end
 computing systems (Blue Gene, Cray).  It enables research in MPI through a
 modular framework for other derived implementations.")
-    (license bsd-2)))
+    (license license:bsd-2)))