Portability fixes, mostly from James for Palm purposes. Mostly

additions of missing 'static' and explicit 'void' in parameter lists,
plus one or two other things like explicitly casting chars in variadic
argument lists to int and using DBL_MAX if HUGE_VAL isn't available.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@9166 cda61777-01e9-0310-a592-d414129be87e