gnu: qttools: Rename to qttools-5.

Automated with:

  git grep -l qttools | xargs sed 's/\bqttools\b/\0-5/g' -i
  git checkout NEWS

gnu/packages/sync.scm

@@ -174,7 +174,7 @@
        ("perl" ,perl)
        ("pkg-config" ,pkg-config)
        ("python" ,python-wrapper)
-       ("qttools" ,qttools)
+       ("qttools-5" ,qttools-5)
        ("ruby" ,ruby)))
     (inputs
      (list appstream
@@ -347,7 +347,7 @@ See also: megacmd, the official tool set by MEGA.")
        ("extra-cmake-modules" ,extra-cmake-modules)
        ("perl" ,perl)
        ("pkg-config" ,pkg-config)
-       ("qtlinguist" ,qttools)))
+       ("qtlinguist" ,qttools-5)))
     (inputs
      (list qtbase-5 qtkeychain sqlite zlib))
     (home-page "https://owncloud.org")