Please add :claw dependencies

[borodust]

Those are all dependencies required by new version of :claw and most libraries that depend on it.

Please, add:

• claw-utils (stable branch) - utilities for :claw
• cffi-c-ref (stable branch) - advanced memory referencing for :claw/CFFI
• claw-support (stable branch) - additional tooling for :claw
• c2ffi-blob (stable branch) - precompiled c2ffi executable

[quicklisp]

All added.