Log Message:
xnp2: pull upstream patches.

* xnp2-r2805.patch
> protect max/min macro for C++.
>
> fix build failure with gcc 6.1.1.

* xnp2-r2846.patch
> x11: Use new SDL2 Audio APIs.
>
> Fix no sound with many audio devices on Ubuntu Desktop 22.04.

This also fixes no sound on NetBSD/i386 10.0.

While here, use https: for MASTER_SITES per a link in the upstream site.

Bump PKGREVISION.