remove emulators/pcsxr

Hi,

pcsxr has always been buggy on OpenBSD, and the upstream is dead and
gone.

There are two other PlayStation emulators in-tree: mednafen, and a
pcsxr-derived core for retroarch, libretro-pcsx-rearmed. Both of them
have seen much more development activity within the last few years
than pcsxr.

I would like to remove pcsxr.

ok?

--
Anthony J. Bentley