Protect X11 calls by a critical section

[Dmitry Timoshkov]

Hello,

Changelog:
    Protect X11 calls by a critical section.

--- cvs/hq/wine/dlls/winex11.drv/event.c	Fri Jul 07 14:40:14 2006
+++ wine/dlls/winex11.drv/event.c	Fri Jul 07 14:51:38 2006
@@ -453,8 +453,10 @@ static void handle_wm_protocols( HWND hw
       xev = *event;
       
       TRACE("NET_WM Ping\n");
+      wine_tsx11_lock();
       xev.window = DefaultRootWindow(xev.display);
       XSendEvent(xev.display, xev.window, False, SubstructureRedirectMask | SubstructureNotifyMask, (XEvent*)&xev);
+      wine_tsx11_unlock();
       /* this line is semi-stolen from gtk2 */
       TRACE("NET_WM Pong\n");
     }