FrontC documentation compilation error

[XVilka]

- ocamlc   unix.cma ../frontc/frontc.cma -o calipso_stat gen.cmo reduce.cmo 
- make[1]: Leaving directory `/home/travis/.opam/4.07.0/.opam-switch/build/FrontC.3.4.2/calipso'
- make[1]: Entering directory `/home/travis/.opam/4.07.0/.opam-switch/build/FrontC.3.4.2/frontc'
- make[1]: Circular cparser.cmx <- clexer.cmx dependency dropped.
- make[1]: Circular cparser.cmx <- clexer.cmx dependency dropped.
- install -d /home/travis/.opam/4.07.0/lib/FrontC
- install frontc.cma cabs.cmi cxml.cmi cprint.cmi clexer.cmi cparser.cmi ctoxml.cmi frontc.cmi /home/travis/.opam/4.07.0/lib/FrontC
- install -d /home/travis/.opam/4.07.0/lib/FrontC
- install frontc.cmxa frontc.a cabs.cmi cxml.cmi cprint.cmi clexer.cmi cparser.cmi ctoxml.cmi frontc.cmi /home/travis/.opam/4.07.0/lib/FrontC
- ocamldoc -html -d ../autodoc  -t "FrontC" cabs.ml cxml.ml cprint.ml ctoxml.ml frontc.ml
- ../autodoc/style.css: No such file or directory
- Fatal error: exception Failure("../autodoc/Cabs.html: No such file or directory")
- make[1]: *** [doc] Error 2
- make[1]: Leaving directory `/home/travis/.opam/4.07.0/.opam-switch/build/FrontC.3.4.2/frontc'
- make[1]: Entering directory `/home/travis/.opam/4.07.0/.opam-switch/build/FrontC.3.4.2/ctoxml'
- install -d /home/travis/.opam/4.07.0/lib/bin
- install ctoxml /home/travis/.opam/4.07.0/lib/bin

See the full log here: https://travis-ci.org/BinaryAnalysisPlatform/bap/jobs/570684148#L2032

It is a build failure for 4.07 OCaml version for my 4.08 PR BinaryAnalysisPlatform/bap#957

[ivg]

we moved to dune so there is no longer this problem :)