Remove setup.data from source control

[tiegz]

This fixes the build for me by removing environment-specific setup.data:

$ make 
ocaml setup.ml -build 
sh: /Users/jamis/.opam/default/bin/ocamlbuild: No such file or directory
E: Failure("Command ''/Users/jamis/.opam/default/bin/ocamlbuild' src/rtc.cma src/rtc.cmxa src/rtc.a src/rtc.cmxs tests/tests.native progs/chapter.native -tag debug' terminated with error code 127")
make: *** [build] Error 1

[jamis]

Good point. Thanks!