gnu: patchmatrix: Update to 0.12.0-1.a0b0b1e.

* gnu/packages/music.scm (patchmatrix): Update to 0.12.0-1.a0b0b1e.
[arguments]: Add phase "make-gzip-archive-writable".

gnu/packages/music.scm

@@ -41,6 +41,7 @@
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system ant)
   #:use-module (guix build-system cmake)
+  #:use-module (guix build-system meson)
   #:use-module (guix build-system python)
   #:use-module (guix build-system scons)
   #:use-module (guix build-system glib-or-gtk)
@@ -3781,20 +3782,31 @@ notation and includes basic support for digital audio.")
     (license license:gpl2)))
 
 (define-public patchmatrix
+  ;; There have been no releases for more than a year.
+  (let ((commit "a0b0b1e791f4574d5abd059cfe1819c71e8b18d5")
+        (revision "1"))
     (package
       (name "patchmatrix")
-    (version "0.12.0")
+      (version (git-version "0.12.0" revision commit))
       (source (origin
                 (method git-fetch)
                 (uri (git-reference
                       (url "https://github.com/OpenMusicKontrollers/patchmatrix.git")
-                    (commit version)))
+                      (commit commit)))
                 (file-name (string-append "patchmatrix-" version "-checkout"))
                 (sha256
                  (base32
-                "19ivp7h5vq6r1qhmycjxzvrgg7fc4a3v5vb3n4c7afs4z3pj53zi"))))
-    (build-system cmake-build-system)
-    (arguments '(#:tests? #f))          ; no test target
+                  "0pph4ra7aci3rbpqvvr564pi16vxrk448bmvp8985cd9lbjlrp3m"))))
+      (build-system meson-build-system)
+      (arguments
+       '(#:tests? #f          ; no test target
+         #:phases
+         (modify-phases %standard-phases
+           (add-before 'reset-gzip-timestamps 'make-gzip-archive-writable
+             (lambda* (#:key outputs #:allow-other-keys)
+               (map make-file-writable
+                    (find-files (assoc-ref outputs "out") ".*\\.gz$"))
+               #t)))))
       (inputs
        `(("jack" ,jack-1)
          ("lv2" ,lv2)
@@ -3806,7 +3818,7 @@ notation and includes basic support for digital audio.")
       (description "PatchMatrix is a patch bay for the JACK audio connection
 kit.  It provides a patch bay in flow matrix style for audio, MIDI, CV, and
 OSC connections.")
-    (license license:artistic2.0)))
+      (license license:artistic2.0))))
 
 (define-public sorcer
   (package