QtQuick.Dialogs: deploy qml files only for debug builds

QML_FILES are installed with the qml plugin they belong to.  This is
helpful for debugging, but redundant because the same QML is also
packaged as resources (after 8780af05b1bc63aa71c3a318972465ffdb830070).

Task-number: QTBUG-31565
Change-Id: I0b277b62b48e0a742f3ef2ff6ee2a81cc071295e
Reviewed-by: Caroline Chao <caroline.chao@digia.com>

src/imports/dialogs/dialogs.pro

@@ -37,7 +37,7 @@ HEADERS += \
     qquickfontdialog_p.h \
     qquickabstractdialog_p.h
 
-QML_FILES += \
+DIALOGS_QML_FILES += \
     DefaultMessageDialog.qml \
     WidgetMessageDialog.qml \
     DefaultFileDialog.qml \
@@ -76,7 +76,7 @@ RESOURCE_CONTENT = \
     "<RCC>" \
     "<qresource prefix=\"/QtQuick/Dialogs\">"
 
-for(resourcefile, QML_FILES) {
+for(resourcefile, DIALOGS_QML_FILES) {
     resourcefileabsolutepath = $$absolute_path($$resourcefile)
     relativepath_in = $$relative_path($$resourcefileabsolutepath, $$_PRO_FILE_PWD_)
     relativepath_out = $$relative_path($$resourcefileabsolutepath, $$OUT_PWD)
@@ -91,4 +91,7 @@ write_file($$GENERATED_RESOURCE_FILE, RESOURCE_CONTENT)|error("Aborting.")
 
 RESOURCES += $$GENERATED_RESOURCE_FILE
 
+# In case of a debug build, deploy the QML files too
+CONFIG(debug, debug|release): QML_FILES += $$DIALOGS_QML_FILES
+
 load(qml_plugin)