[ocaml] improve compatibility with OCaml 4.08

Makefile.generating

configure.in

opam/opam

share/Makefile.config.in

src/kernel_services/abstract_interp/offsetmap.ml

src/kernel_services/ast_queries/cil_datatype.ml

...rnel_services/ast_queries/json_compilation_database.ok.ml

src/kernel_services/cmdline_parameters/cmdline.ml

src/kernel_services/plugin_entry_points/dynamic.ml

src/kernel_services/plugin_entry_points/log.ml

src/kernel_services/plugin_entry_points/plugin.ml

src/libraries/stdlib/extlib.ml

src/libraries/stdlib/transitioning.ml.in

src/libraries/stdlib/transitioning.mli

src/libraries/utils/command.ml

src/plugins/aorai/ltl_output.ml

src/plugins/metrics/metrics_cabs.ml

src/plugins/rte/visit.ml

src/plugins/value/domains/numerors/numerors_domain.ok.ml

src/plugins/value_types/cvalue.ml