* gnu/packages/lisp.scm (sbcl-stumpwm)[outputs]: Remove "bin" and add "lib".
[arguments]<#:phases>: Change the target of `build-program' to the "out"
output. Likewise, change the target of the desktop file generation.
(sbcl-stumpwm+slynk)[inputs]: Use the "lib" output of sbcl-stumpwm.