gnu: qtwayland-5: Update to 5.15.8.

* gnu/packages/qt.scm (qtwayland-5): Update to 5.15.8.
[arguments]: Use gexps.

gnu/packages/qt.scm

@@ -1608,9 +1608,10 @@ (define-public qtmultimedia
     (license (package-license qtbase))))
 
 (define-public qtwayland-5
-  (package (inherit qtsvg-5)
+  (package
+    (inherit qtsvg-5)
     (name "qtwayland")
-    (version "5.15.5")
+    (version "5.15.8")
     (source (origin
               (method url-fetch)
               (uri (qt-urls name version))
@@ -1619,11 +1620,11 @@ (define-public qtwayland-5
                                        "qtwayland-cleanup-callbacks.patch"))
               (sha256
                (base32
-               "0yy8qf9kn15iqsxi2r7jbcsc0vsdyfz7bbxmfn4i9qmz1yvg0jgr"))))
+                "0aa5jcvvap6qca6imdkhs1mhv5bnaxn466mmpl7x78jx1za7n3ps"))))
     (arguments
      (substitute-keyword-arguments (package-arguments qtsvg-5)
        ((#:phases phases)
-        `(modify-phases ,phases
+        #~(modify-phases #$phases
             (add-after 'unpack 'disable-failing-tests
               (lambda _
                 ;; FIXME: tst_seatv4::animatedCursor() fails for no good
@@ -1638,8 +1639,7 @@ (define-public qtwayland-5
               (lambda _
                 ;; Do not fail just because /etc/machine-id is missing.
                 (setenv "DBUS_FATAL_WARNINGS" "0")))))))
-    (native-inputs
-     (list glib perl pkg-config qtdeclarative-5))
+    (native-inputs (list glib perl pkg-config qtdeclarative-5))
     (inputs
      (list fontconfig
            freetype