Be more liberal with Sys.ocaml_version
#67
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The Dune changes in #54 require a new release of stdcompat for any point releases of OCaml (for example 5.3.1). While 4.07.1 required a minor update, this is very much the exception rather than the rule, and it seems better that the version detection be more liberal. There's also a window on trunk OCaml before anything new is added where the package is still usable.
This change proposes being as liberal as
configure.ac---compiler-versionstill requires a recognised OCaml version, though.