gnu: qtbase: Don't propagate mesa.

* gnu/packages/qt.scm (qtbase)[propagated-inputs]: Move mesa ...
[inputs]: ... to here.
(qtsvg)[propagated-inputs]: No need to clear propagated-inputs.

gnu/packages/qt.scm

@@ -322,8 +322,6 @@ (define-public qtbase
                 ;; passing "-system-sqlite".
                 (delete-file-recursively "src/3rdparty/sqlite")))))
     (build-system gnu-build-system)
-    (propagated-inputs
-     `(("mesa" ,mesa)))
     (inputs
      `(("alsa-lib" ,alsa-lib)
        ("cups" ,cups)
@@ -349,6 +347,7 @@ (define-public qtbase
        ("libxrender" ,libxrender)
        ("libxslt" ,libxslt)
        ("libxtst" ,libxtst)
+       ("mesa" ,mesa)
        ("mtdev" ,mtdev)
        ("mysql" ,mysql)
        ("nss" ,nss)
@@ -445,7 +444,6 @@ (define-public qtsvg
              (sha256
               (base32
                "08ca5g46g75acy27jfnvnalmcias5hxmjp7491v3y4k9y7a4ybpi"))))
-    (propagated-inputs `())
     (native-inputs `(("perl" ,perl)))
     (inputs
      `(("mesa" ,mesa)