winex11: Manage the system tray stand-alone window in x11drv for non-desktop mode.

dlls/winex11.drv/x11drv.h

@@ -597,6 +597,7 @@ extern int use_xkb;
 extern int use_take_focus;
 extern int use_primary_selection;
 extern int use_system_cursors;
+extern int show_systray;
 extern int usexcomposite;
 extern int managed_mode;
 extern int decorated_mode;

dlls/winex11.drv/x11drv_main.c

@@ -83,6 +83,7 @@ int use_xkb = 1;
 int use_take_focus = 1;
 int use_primary_selection = 0;
 int use_system_cursors = 1;
+int show_systray = 1;
 int managed_mode = 1;
 int decorated_mode = 1;
 int private_color_map = 0;
@@ -400,6 +401,9 @@ static void setup_options(void)
     if (!get_config_key( hkey, appkey, "UseSystemCursors", buffer, sizeof(buffer) ))
         use_system_cursors = IS_OPTION_TRUE( buffer[0] );
 
+    if (!get_config_key( hkey, appkey, "ShowSystray", buffer, sizeof(buffer) ))
+        show_systray = IS_OPTION_TRUE( buffer[0] );
+
     screen_depth = 0;
     if (!get_config_key( hkey, appkey, "ScreenDepth", buffer, sizeof(buffer) ))
         screen_depth = atoi(buffer);