gnu: simple-scan: Update to 3.19.91.

* gnu/packages/gnome.scm (simple-scan): Update to 3.19.91.
[arguments]: Add 'clean' phase.

gnu/packages/gnome.scm

@@ -3382,7 +3382,7 @@ (define-public gusb
 (define-public simple-scan
   (package
     (name "simple-scan")
-    (version "3.17.4")
+    (version "3.19.91")
     (source (origin
               (method url-fetch)
               (uri (string-append "https://launchpad.net/simple-scan/"
@@ -3391,7 +3391,7 @@ (define-public simple-scan
                                   version ".tar.xz"))
               (sha256
                (base32
-                "1pslbv45g01g039zj2b01k08f763kkhzqw8wwz7yh27m7bjllnx6"))))
+                "1c5glf5vxgld41w4jxfqcv17q76qnh43fawpv33hncgh8d283xkf"))))
     (build-system glib-or-gtk-build-system)
     (inputs
      `(("gtk" ,gtk+)
@@ -3409,6 +3409,21 @@ (define-public simple-scan
        ("pkg-config" ,pkg-config)
        ("vala" ,vala)
        ("xmllint" ,libxml2)))
+    (arguments
+     '(#:configure-flags '("--disable-packagekit")
+       #:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'clean
+                    (lambda _
+                      ;; Remove a left-over reference to PackageKit.
+
+                      ;; https://bugs.launchpad.net/simple-scan/+bug/1462769
+
+                      ;; There are some generated C files erroneously
+                      ;; included in the source distribution, and this
+                      ;; one breaks the build by referring to a
+                      ;; non-existent header (packagekit.h)
+                      (delete-file "src/ui.c"))))))
     (home-page "https://launchpad.net/simple-scan")
     (synopsis "Document and image scanner")
     (description "Simple Scan is an easy-to-use application, designed to let