gnu: marble-qt: Update to 21.08.3.

* gnu/packages/kde.scm (marble-qt): Update to 21.08.3.
[build-system]: Use qt-build-system.
[arguments]<#:configure-flags>: Pass "-DBUILD_MARBLE_TESTS=FALSE".
[license]: Change to lgpl2.1+.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

gnu/packages/kde.scm

@@ -988,29 +988,27 @@ Python, PHP, and Perl.")
     (license (list license:gpl2+  license:fdl1.2+))))
 
 (define-public marble-qt
-  (let ((release "17.08")
-        (commit "fc7166eeef784732033c999ba605364f9c82d21c")
-        (revision "1"))
   (package
     (name "marble-qt")
-      (version (git-version release revision commit))
+    (version "21.08.3")
     (source
      (origin
        (method git-fetch)
        (uri (git-reference
              (url "https://invent.kde.org/education/marble.git/")
-               (commit commit)))
+             (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
-          (base32 "0m0sf3sddaib7vc5lhbmh7ziw07p1hahg02f65sgfylyl5f5kj92"))
-         (patches (search-patches
-                   "marble-qt-add-qt-headers.patch"))))
-      (build-system cmake-build-system)
+        (base32 "15gqym45z0gjzdc4ypfj0fki96c3dad4ygsi6lfr8yvwsx8swrb6"))))
+    (build-system qt-build-system)
     (arguments
-       `(#:tests? #f                    ; libmarblewidget-qt5.so.28 not found
+     ;; FIXME: libmarblewidget-qt5.so.28 not found.  Also enable the
+     ;; corresponding configure flag to build tests.
+     `(#:tests? #f
        #:configure-flags
        '("-DCMAKE_BUILD_TYPE=Release"
-           "-DWITH_KF5=FALSE")))
+         "-DWITH_KF5=FALSE"
+         "-DBUILD_MARBLE_TESTS=FALSE")))
     (native-inputs
      `(("qttools" ,qttools)))
     (inputs
@@ -1025,7 +1023,7 @@ Python, PHP, and Perl.")
 becomes a world atlas, while OpenStreetMap takes the user to street level.  It
 supports searching for places of interest, viewing Wikipedia articles,
 creating routes by drag and drop and more.")
-      (license license:gpl3))))
+    (license license:lgpl2.1+)))
 
 (define-public okular
   (package