[ocaml] improve compatibility with 4.08: Pervasives.compare

devel_tools/ocamldep_transitive_closure.ml

ptests/ptests.ml

src/kernel_services/abstract_interp/abstract_interp.ml

src/kernel_services/abstract_interp/float_interval.ml

src/kernel_services/ast_data/alarms.ml

src/kernel_services/ast_data/property.ml

src/kernel_services/ast_data/property_status.ml

src/kernel_services/ast_printing/description.ml

src/kernel_services/ast_queries/cil_datatype.ml

src/kernel_services/ast_queries/file.ml

src/kernel_services/ast_queries/logic_typing.ml

src/kernel_services/ast_queries/logic_utils.ml

src/libraries/datatype/datatype.ml

src/libraries/stdlib/FCHashtbl.ml

src/libraries/stdlib/transitioning.ml.in

src/libraries/utils/bitvector.ml

src/libraries/utils/json.mll

src/libraries/utils/pretty_utils.ml

src/libraries/utils/pretty_utils.mli

src/libraries/utils/rgmap.ml