Add scheme/fixnum to the list of require'd modules, meaning the type declarations for fixnum operations are actually bound to the correct functions and so Typed Scheme programs using fixnum ops will actually compile.
Add scheme/fixnum to the list of require'd modules, meaning the type declarations for fixnum operations are actually bound to the correct functions and so Typed Scheme programs using fixnum ops will actually compile.

svn: r18522

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket