The requirements and the platform page name SBCL alone, the test
commands no longer run CCL, and the note on CCL's 260-character paths
goes. The allocation claims drop their "on SBCL".
Getting started and the tests take cl-ffi from the commit the stiftfile
pins. stift does not run on Windows yet, so until it does the suite runs
with the dependencies where ASDF finds them and Parachute from Quicklisp.
Follows cl-win32 ef99c33: the raw layer's functions are plain cl-ffi
defcfuns, with no calling convention to name, and getting started says
where cl-ffi comes from.
