Log message:
Remove stray references to pkgsrc-wip

Log message:
Import keystone-0.9 as emulators/keystone

Keystone is a lightweight multi-platform, multi-architecture assembler
framework.

It offers some unparalleled features:
 *   Multi-architecture, with support for Arm, Arm64 (AArch64/Armv8), Hexagon,
     Mips, PowerPC, Sparc, SystemZ & X86 (include 16/32/64bit).
 *   Clean/simple/lightweight/intuitive architecture-neutral API.
 *   Implemented in C/C++ languages, with bindings for Python, NodeJS, Ruby,
     Go & Rust available.
 *   Native support for Windows & *nix (with Mac OSX, Linux, *BSD & Solaris
     confirmed).
 *   Thread-safe by design.
 *   Open source - with a dual license.

Keystone is based on LLVM, but it goes much further with a lot more to offer.

Originally packaged in pkgsrc-wip by myself.