Fix feature dependencies of qmlscene and qmleasing tools

Add missing guard for header include in qmlscene and skip build of
qmleasing on disabled feature.

This fixes build with -no-feature-action configuration.

Change-Id: I3b0f248e57495bbbd9a0250300f2e3ca82a01a72
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

tools/qmlscene/main.cpp

@@ -51,8 +51,10 @@
 
 #ifdef QT_WIDGETS_LIB
 #include <QtWidgets/QApplication>
+#if QT_CONFIG(filedialog)
 #include <QtWidgets/QFileDialog>
-#endif
+#endif // QT_CONFIG(filedialog)
+#endif // QT_WIDGETS_LIB
 
 #include <QtCore/QTranslator>
 #include <QtCore/QLibraryInfo>

tools/tools.pro

@@ -28,7 +28,13 @@ qtConfig(qml-devtools) {
                     qmlplugindump
             }
         }
-        qtHaveModule(widgets): SUBDIRS += qmleasing
+        qtHaveModule(widgets) {
+            QT_FOR_CONFIG += widgets
+            qtConfig(dialogbuttonbox) {
+                SUBDIRS += \
+                    qmleasing
+            }
+        }
     }
     qtHaveModule(qmltest): SUBDIRS += qmltestrunner
     qtConfig(private_tests): SUBDIRS += qmljs