gnu: lilypond: Update to 2.19.51.

* gnu/packages/music.scm (lilypond): Update to 2.19.51.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu/packages/music.scm

@@ -504,7 +504,7 @@ interface.  It is implemented as a frontend to @code{klick}.")
 (define-public lilypond
   (package
     (name "lilypond")
-    (version "2.19.33")
+    (version "2.19.51")
     (source (origin
               (method url-fetch)
               (uri (string-append
@@ -513,7 +513,7 @@ interface.  It is implemented as a frontend to @code{klick}.")
                     name "-" version ".tar.gz"))
               (sha256
                (base32
-                "0s4vbbfy4xwq4da4kmlnndalmcyx2jaz7y8praah2146qbnr90xh"))))
+                "1b4jvc0fixbnp8x457fzk5wgb4zd03npwwivp60kc27fmv63w5l1"))))
     (build-system gnu-build-system)
     (arguments
      `(#:tests? #f ; out-test/collated-files.html fails