[Patch, gfortran]: PR21820, 23363 etc.: chuck mmap

[Tobias Schlüter]

FX Coudert wrote:
>>The patch also solves all mmap related correctness problems, by
> 
>  > removing mmap support from the runtime library.
> 
> Although I think using fd-based I/O should clearly be favoured seeing 
> the timing results, I think it is a mistake to remove the code: it's in 
> good shape, i think we should keep it within #if 0 ... #endif.

I don't think it makes sense to keep dead code around, that's what we have
version control for.

- Tobi