[PATCH][memory-mapped-files] Allow memory mapping files bigger than MAX_INT

[lou]

Hi,

I hope I'm sending this to the right address, cc'ing Peter Bex
because he's mentioned in the .egg definition.

The `memory-mapped-files` egg currently treats the `length` and
`offset` parameters of `mmap` as integers which arbitrarily
restricts mapable files to a size of MAX_INT bytes.

By simply changing the type declaration in the `foreign-lambda`
definitions we can allow basically arbitrarily big files to be
mapped.

Ultimately I'm looking to also patch the `simple-md5` egg to be
able to hash arbitrarily big files. Currently it has the same
restriction.

Caveats:
 1. I have no insight if this was a deliberate restriction that
    works around some issue I'm not aware of.
 2. I'm not able to test the code for any platform but linux.


I have basically no experience with svn, I hope I got the patch
format right, let me know if not.

~~lou

00-chicken-mmap-size_t.patch
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