1.0.3.42: two LOOP buglets

1.0.3.42: two LOOP buglets
 * Avoid bogus package-lock violations from LOOP, don't declare types
   for special variables in COMMON-LISP. Reported by Eric Marsen on
   sbcl-devel.
 * Avoid attempts to coerce loop variable initialization values to
   range-limited types. Reported by Andras Simon on sbcl-devel.