winex11: Delete the palette and xrender static critical sections when unloading the dll.

dlls/winex11.drv/palette.c

@@ -275,6 +275,7 @@ void X11DRV_PALETTE_Cleanup(void)
 		  COLOR_gapFilled, 0);
       wine_tsx11_unlock();
   }
+  DeleteCriticalSection(&palette_cs);
 }
 
 /***********************************************************************

dlls/winex11.drv/xrender.c

@@ -1118,6 +1118,7 @@ void X11DRV_XRender_Finalize(void)
     for(i = mru; i >= 0; i = glyphsetCache[i].next)
 	FreeEntry(i);
     LeaveCriticalSection(&xrender_cs);
+    DeleteCriticalSection(&xrender_cs);
 }
 
 /**********************************************************************