Reorder files in .asd to get rid of warnings

Because of the whitespace noise, this is what changed:

- font-rendering.lisp moved from close to the bottom to the top.
- bindings.lisp and events.lisp moved before window.lisp.
Ignore unused variable name

This gets rid of the last style warning on SBCL
Remove outdated Clisp workarounds

The fixes seem to have been merged into Clisp in 2008.
Add :INTERACTIVE to restart to fix Clisp warning

The HyperSpec entry for RESTART-CASE and Clisp seem to disagree on the
need for :INTERACTIVE to make a restart interactively invokable.
Move stumpwm.lisp higher in the .asd

Now LOAD-RC-FILE is defined when loading user.lisp.
Fix use of changed, unexported clisp ffi function
Merge pull request #152 from jorams/fix-warning

Get rid of warnings during compilation
Merge pull request #153 from jorams/fix-clisp

Fix Clisp, fixes #147