support cygwin with sbcl 

This patch enable to support  Cygwin & sbcl .

* add manipulate $OSTYPE code to shly
* change asdf:run-shell-command to uiop:run-program

thank you.
[MUST] Did you try this code?
`[ "$OSTYPE" = "darwin"* ]` doesn't work on my environment.
`case` would be a better choice.