[CMake] Support for building of OCaml software?

[SF Markus Elfring]

> > Would further checks be useful for tools like "as" (GNU assembler),
> "ar" and "ranlib" from the software package "binutils"?
> [...] Do you have an example where it is necessary ?

How do you think about to consider a few more dependencies around the
tool "flexlink" from the software "FlexDLL" for Windows environments?
https://github.com/ocaml/ocaml/blob/dd17af8b4342a8255173ebda7102e50de1bd2ec9/configure#L369

Regards,
Markus