gnu: wavpack: Update to 5.1.0.

* gnu/packages/audio.scm (wavpack): Update to 5.1.0.
[arguments]: Remove field.

gnu/packages/audio.scm

@@ -2102,19 +2102,15 @@ stretching and pitch scaling of audio.  This package contains the library.")
 (define-public wavpack
   (package
     (name "wavpack")
-    (version "4.70.0")
+    (version "5.1.0")
     (source (origin
               (method url-fetch)
               (uri (string-append "http://www.wavpack.com/"
                                   name "-" version ".tar.bz2"))
               (sha256
                (base32
-                "191h8hv8qk72hfh1crg429i9yq3cminwqb249sy9zadbn1wy7b9c"))))
+                "0i19c6krc0p9krwrqy9s5xahaafigqzxcn31piidmlaqadyn4f8r"))))
     (build-system gnu-build-system)
-    (arguments
-     `(#:configure-flags
-       ;; wavpack.pc.in lacks path substitution for 'exec_prefix'.
-       (list (string-append "--libdir=" %output "/lib"))))
     (home-page "http://www.wavpack.com/")
     (synopsis "Hybrid lossless audio codec")
     (description