Added versions 1.8.3 and 1.9.1 of OCaml EFL.
Added missing opam version.
Added -fPIC for Bullet compilation.
Added options when building Bullet.
Updated depext file.
ocaml-efl: add prefix /usr to depext.
ocaml-efl: removed temporarily v1.9.1 for the testing of 1.8.3.
ocaml-efl: temporarly removed v1.9.0 for the test of 1.8.3.
ocaml-efl: re-added versions 1.9.0 and 1.9.1.
ocaml-efl: added v1.10.0.
Merge pull request #2266 from axiles/master

Added versions 1.8.3 and 1.9.1 of OCaml EFL.