1.0.21.6: muffle compiler notes from EVAL and function generator construction

1.0.21.6: muffle compiler notes from EVAL and function generator construction

 * Just add (DECLARE (MUFFLE-CONDITIONS COMPILER-NOTE)) to the lambdas
   we cons up: in case of EVAL the notes are distractive and seem
   pointless, and in case of generators the user is definitely not
   interested.

 * Adjust SB-CLTL2 tests slightly to account for possible pre-existing
   MUFFLE-CONDITIONS declarations, and fix usage of SPECIAL-BINDINGS.