gnu: lilypond: Update to 2.20.0.

* gnu/packages/music.scm (lilypond): Update to 2.20.0.
[native-inputs]: Use texi2html-1.82 instead of texi2html.

gnu/packages/music.scm

@@ -904,19 +904,18 @@ Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro
 (define-public lilypond
   (package
     (name "lilypond")
-    (version "2.19.80")
-    (source (origin
+    (version "2.20.0")
+    (source
+     (origin
        (method url-fetch)
-              (uri (string-append
-                    "http://download.linuxaudio.org/lilypond/sources/v"
-                    (version-major+minor version) "/"
-                    name "-" version ".tar.gz"))
+       (uri (string-append "http://lilypond.org/download/sources/"
+                           "v" (version-major+minor version) "/"
+                           "lilypond-" version ".tar.gz"))
        (sha256
-               (base32
-                "0lql4q946gna2pl1g409mmmsvn2qvnq2z5cihrkfhk7plcqdny9n"))))
+        (base32 "0qd6pd4siss016ffmcyw5qc6pr2wihnvrgd4kh1x725w7wr02nar"))))
     (build-system gnu-build-system)
     (arguments
-     `(#:tests? #f ; out-test/collated-files.html fails
+     `(#:tests? #f                      ;out-test/collated-files.html fails
        #:out-of-source? #t
        #:make-flags '("conf=www")       ;to generate images for info manuals
        #:configure-flags
@@ -984,7 +983,7 @@ Sega Master System/Mark III, Sega Genesis/Mega Drive, BBC Micro
                                         texlive-latex-lh
                                         texlive-latex-cyrillic)))
        ("texinfo" ,texinfo)
-       ("texi2html" ,texi2html)
+       ("texi2html" ,texi2html-1.82)
        ("rsync" ,rsync)
        ("pkg-config" ,pkg-config)
        ("zip" ,zip)))