Add support for freestanding targets #22
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Accept `*-none` and `*-elf*` triplets for all the architectures with a native backend to describe the corresponding freestanding target Define `system` to `none` is such cases Rationale: the last component of the target triplet is usually the OS; for freestanding targets, the most commonly used placeholders one might want to target with OCaml are `none` and `elf*`.
Set the value of `Sys.os_type` (for compiled programs) and of the `os_type` compiler configuration to `None` for freestanding targets
The freestanding targets currently used rely on either GNU `ld` or `lld`. GNU `ld` now requires the explicit mention that the stack should not be executable by seeing the `.note.GNU-stack` section. `lld` ignores this section. Recall that on freestanding targets, `system` is set to `none`.
Allow the use of *-*-ocaml or *-*-*-ocaml target triplets to stand for freestanding cross compilers by temporarily rewriting the target OS to `none` when generating the canonical target This allows to use *-*-ocaml and *-*-*-ocaml prefixes for cross-compiler specific toolchains, so that all the specific tools (for instance aarch64-solo5-ocaml-gcc, etc.) can be discovered automatically by `configure`
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