gnu: python-pytaglib: Update to 3.1.0.

* gnu/packages/mp3.scm (python-pytaglib): Update to 3.1.0, use
G-Expressions.
[source]: Switch to git-fetch; remove redundund snippet.
[build-system]: Switch to pyproject-build-system.
[inputs]: Remove taglib; add taglib-next.
[native-inputs]: Add python-setuptools.

Fixes: guix/guix#4662
Change-Id: I44610089ec59a60c8e1ae59cd7a479a516f60067

gnu/packages/mp3.scm

@@ -763,39 +763,36 @@ fingerprinting library and the Acoustid API.")
 (define-public python-pytaglib
   (package
     (name "python-pytaglib")
-    (version "1.4.6")
+    (version "3.1.0")
     (source
      (origin
-       (method url-fetch)
-       (uri (pypi-uri "pytaglib" version))
+       (method git-fetch)
+       (uri (git-reference
+              (url "https://github.com/supermihi/pytaglib")
+              (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
        (sha256
-        (base32
-         "0li970qslfymz4vk1wrij2nfqw3l15cpc3fjjci48mpvg17gbnhn"))
-       ;; Delete file generated by Cython.
-       (modules '((guix build utils)))
-       (snippet
-        '(begin
-           (delete-file "src/taglib.cpp")))))
-    (build-system python-build-system)
+        (base32 "178vvc0rq932w9hmzb1cxlzhzfs5npibrpx41r0zidmhcpv4gr03"))))
+    (build-system pyproject-build-system)
     (arguments
-     '(#:phases
-       (modify-phases %standard-phases
-         ;; Ensure that the Cython file is regenerated.
-         (add-after 'unpack 'setup-environment
-           (lambda _
-             (setenv "PYTAGLIB_CYTHONIZE" "1"))))))
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
+          ;; Ensure that the Cython file is regenerated.
+          (add-after 'unpack 'setup-environment
+            (lambda _
+              (setenv "PYTAGLIB_CYTHONIZE" "1"))))))
     (native-inputs
-     (list python-cython python-pytest))
+     (list python-cython
+           python-pytest
+           python-setuptools))
     (inputs
-     (list taglib))
-    (home-page
-     "https://github.com/supermihi/pytaglib")
-    (synopsis
-     "Python bindings for taglib")
+     (list taglib-next))
+    (home-page "https://github.com/supermihi/pytaglib")
+    (synopsis "Python bindings for taglib")
     (description
-     "This package is a Python audio tagging library.  It is
-cross-platform, works with all Python versions, and is very
-simple to use yet fully featured.")
+     "This package is a Python audio tagging library.  It is cross-platform,
+ works with all Python versions, and is very simple to use yet fully featured.")
     (license license:gpl3)))
 
 (define-public wavbreaker