NPAPI plugin forgot to call destroy_windows()

X connection created by XOpenDisplay() or xcb_connect() will not be closed without calling destroy_windows(). Since Xorg limit maximum clients of a single process. Plugin will soon crash if user refreshes a lot page with VLC plugin embeded.

We should call destroy_windows() inside NPP_Destroy().

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information