Re: First cut at git port to Cygwin

> Make read_cache copy the index into memory, to improve portability on
> other OS's which have mmap too, tend to use it less commonly.
> 
> Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
> 
> diff --git a/read-cache.c b/read-cache.c
> --- a/read-cache.c
> +++ b/read-cache.c
> @@ -497,9 +497,12 @@ int read_cache(void)
>  	offset = sizeof(*hdr);
>  	for (i = 0; i < active_nr; i++) {
>  		struct cache_entry *ce = map + offset;
> -		offset = offset + ce_size(ce);
> -		active_cache[i] = ce;
> +		size_t size = ce_size(ce);
> +		struct cache_entry *newce = malloc(size);
> +		offset = offset + size;
> +		active_cache[i] = memcpy(newce, ce, size);
>  	}
> +	munmap(map, size);
>  	return active_nr;
>  
>  unmap: