fix dependency of salsa20.lisp on fndb.lisp (#80)
fix dependency of salsa20.lisp on fndb.lisp (#80)

On certain SBCL versions, SALSA-CORE in salsa20.lisp calls
X-SALSA-CORE which is only defined after fndb.lisp has been loaded.
froydnj/ironclad,eadmund/ironclad,glv2/ironclad,sharplispers/ironclad