gnu: qtdeclarative: Add a debug output.

* gnu/packages/qt.scm (qtdeclarative) [outputs]: New field.

Series-version: 3
Series-to: 65922@debbugs.gnu.org
Series-prefix: qt-team
Cover-letter:
Avoid capturing python in qtbase, reinstate tests
Thes series removes Python from the closure of qtbase, both for versions 5.15
and 6.5.  It also reinstate a few tests that was made possible thanks to
discussions with upstream following reported the issues.
END

gnu/packages/qt.scm

@@ -1372,6 +1372,7 @@ with JavaScript and C++.")))
                (base32
                 "06c7xfqn2a5s2m8j1bcvx3pyjqg1rgqkjvp49737gb4z9vjiz8gk"))
               (patches (search-patches "qtdeclarative-disable-qmlcache.patch"))))
+    (outputs '("out" "debug"))
     (build-system cmake-build-system)
     (arguments
      (list