gnu: java-openjfx-graphics: Make java-swt optional.

It is used for an optional part of openjfx and not used by current
packages in Guix. Swt has a reference to a library in the JDK and has a
huge closure size because of that.  This reduces closure by 1GB for this
package and dependents (including josm).

* gnu/packages/java.scm (java-openjfx-graphics)[native-inputs]: Move java-swt...
[inputs]: ...to here.

Change-Id: I7d8cb14569d5a9f451944695225a2dff143bf190

gnu/packages/java.scm

@@ -2311,7 +2311,9 @@ distribution.")))
                                         (string-append target new-name))))
                          (find-files "netbeans" "\\.so$"))))))))
     (propagated-inputs
-     (list java-openjfx-base java-swt))
+     (list java-openjfx-base))
+    (inputs
+     (list java-swt))
     ;; XXX: for unknown reasons
     ;; modules/graphics/src/main/native-prism-sw/JNativeSurface.c is missing
     ;; in this revision.