gnu: stargate: Fix locating portmidi.

* gnu/packages/music.scm (stargate)[inputs]: Replace portmidi with
portmidi-2.
[arguments]<#:phases>: Replace patch-portaudio-path with
patch-portaudio-and-portmidi-paths.

Change-Id: Icd5dbe154d2f8cdb9a18006b03ce74ea73d328d4

gnu/packages/music.scm

@@ -5343,13 +5343,16 @@ can receive input from a MIDI keyboard.")
                    (string-append "CXX=" #$(cxx-for-target)))
            #:phases
            #~(modify-phases %standard-phases
-               (add-after 'unpack 'patch-portaudio-path
+               (add-after 'unpack 'patch-portaudio-and-portmidi-paths
                  (lambda* (#:key inputs #:allow-other-keys)
                    (substitute* "src/sgui/widgets/hardware_dialog.py"
                      (("\\\"libportaudio")
                       (string-append "\"" (assoc-ref inputs "portaudio")
-                                     "/lib/libportaudio")))))
-               (add-after 'patch-portaudio-path 'change-directory
+                                     "/lib/libportaudio"))
+                     (("'libportmidi")
+                      (string-append "'" (assoc-ref inputs "portmidi")
+                                     "/lib/libportmidi")))))
+               (add-after 'patch-portaudio-and-portmidi-paths 'change-directory
                  (lambda _
                    (chdir "src")))
                (delete 'configure) ;no configure script
@@ -5396,7 +5399,7 @@ can receive input from a MIDI keyboard.")
            jq
            libsndfile
            portaudio
-           portmidi
+           portmidi-2
            python
            python-jinja2
            python-mido