gnu: hexchat: Update to 2.16.0.

* gnu/packages/messaging.scm (hexchat): Update to 2.16.0.
[source]: Remove patch.
[inputs]: Remove libnotify and libproxy.  Upgrade python-2 to python@3.
Add python-cffi and bash-minimal.
[arguments]: Don't explicitly return #t from phases.
Add a new 'wrap-program phase.

gnu/packages/messaging.scm

@@ -85,6 +85,7 @@
   #:use-module (gnu packages kerberos)
   #:use-module (gnu packages less)
   #:use-module (gnu packages libcanberra)
+  #:use-module (gnu packages libffi)
   #:use-module (gnu packages libidn)
   #:use-module (gnu packages libreoffice)
   #:use-module (gnu packages linux)
@@ -709,15 +710,14 @@ used by Pidgin and Bitlbee, among others, to access
 (define-public hexchat
   (package
     (name "hexchat")
-    (version "2.14.3")
-    (source (origin
-              (method url-fetch)
-              (uri (string-append "https://dl.hexchat.net/hexchat/hexchat-"
-                                  version ".tar.xz"))
-              (patches (search-patches "hexchat-add-libera-chat.patch"))
-              (sha256
-               (base32
-                "10p829jm1r6kidkgf5lhqhyqc5mxdcq96q3zhadsckasvc9rs6lh"))))
+    (version "2.16.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://dl.hexchat.net/hexchat/hexchat-"
+                           version ".tar.xz"))
+       (sha256
+        (base32 "0dnwhb2gi08i5v79vq0y2izs89wyk3by96jv99kgkidjic3k2bj1"))))
     (build-system meson-build-system)
     (native-inputs `(("gettext" ,gettext-minimal)
                      ("glib:bin" ,glib "bin")       ;need glib-genmarshal
@@ -728,14 +728,16 @@ used by Pidgin and Bitlbee, among others, to access
               ("enchant" ,enchant)
               ("gtk" ,gtk+-2)
               ("libcanberra" ,libcanberra)
-              ("libnotify" ,libnotify)
-              ("libproxy" ,libproxy)
               ("openssl" ,openssl)
 
               ;; Bindings for add-on scripts.
               ("luajit" ,luajit)
               ("perl-xml-parser" ,perl-xml-parser)
-              ("python-2" ,python-2)))
+              ("python" ,python)
+              ("python-cffi" ,python-cffi)
+
+              ;; For the ensuing WRAP-PROGRAM.
+              ("bash-minimal" ,bash-minimal)))
     (arguments
      `(#:phases
        (modify-phases %standard-phases
@@ -747,8 +749,14 @@ used by Pidgin and Bitlbee, among others, to access
              ;; just skip this code.
              (substitute* "meson_post_install.py"
                (("if 'DESTDIR' not in os.environ:")
-                 "if False:"))
-             #t)))))
+                "if False:"))))
+         (add-after 'install 'wrap-program
+           ;; Let it ‘initialize the Python-CFFI embedding logic’ at run time.
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let* ((out (assoc-ref outputs "out"))
+                    (bin (string-append out "/bin")))
+               (wrap-program (string-append bin "/hexchat")
+                 `("PYTHONPATH" ":" prefix (,(getenv "PYTHONPATH"))))))))))
     (synopsis "Graphical IRC client")
     (description
      "HexChat lets you connect to multiple IRC networks at once.  The main