npapi win32: added support of Event Listeners

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

npapi/support/npwin.cpp

@@ -212,6 +212,13 @@ void NPN_Version(int* plugin_major, int* plugin_minor, int* netscape_major, int*
     *netscape_minor = LOBYTE(g_pNavigatorFuncs->version);
 }
 
+void NPN_PluginThreadAsyncCall(NPP plugin, void (*func)(void *), void *userData)
+{
+#if (((NP_VERSION_MAJOR << 8) + NP_VERSION_MINOR) >= 20)
+    (g_pNavigatorFuncs->pluginthreadasynccall)(plugin, func, userData);
+#endif
+}
+
 NPError NPN_GetValue(NPP instance, NPNVariable variable, void *result)
 {
     return g_pNavigatorFuncs->getvalue(instance, variable, result);

npapi/vlcplugin_base.cpp

@@ -375,7 +375,7 @@ void VlcPluginBase::eventAsync(void *param)
 void VlcPluginBase::event_callback(const libvlc_event_t* event,
                 NPVariant *npparams, uint32_t npcount)
 {
-#ifdef XP_UNIX
+#if defined(XP_UNIX) || defined(XP_WIN)
     events.callback(event, npparams, npcount);
     NPN_PluginThreadAsyncCall(getBrowser(), eventAsync, this);
 #else