embed a VERSIONINFO resource into QML plugins

On Windows, we set VERSION for QML plugins, because this embeds a
VERSIONINFO resource into the DLL that can be inspected by the user.

Change-Id: Ifb42efed6ceee05d05f61a271e028776cac6a3a2
Task-number: QTBUG-46473
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>

mkspecs/features/qml_plugin.prf

@@ -25,6 +25,12 @@ if(win32|mac):!macx-xcode {
 }
 isEmpty(TARGETPATH): TARGETPATH = $$eval(QT.$${CXX_MODULE}.name)
 
+!no_cxx_module:win32:CONFIG(shared, static|shared) {
+    # Embed a VERSIONINFO resource into the plugin's DLL.
+    isEmpty(VERSION): VERSION = $$MODULE_VERSION
+    CONFIG += skip_target_version_ext
+}
+
 # Insert the plugins URI into its meta data to enable usage
 # of static plugins in QtDeclarative:
 URI = $$replace(TARGETPATH, "/", ".")