[fedora-arm] updated mongodb atomics patch

[Jon Masters]

Hi Folks,

This is a work in progress. It builds on v7, but I've not tested yet.

We've a few dependency issues building this on F19 just now, but it will
build for v7 against 2.2.3 on F18 as well locally. If someone with more
knowledge of mongo would like to take a poke/test, cool. I have done a
literal port of the x86_64 implementation (hence it contains a few
superfluous bits intentionally). It'll need cleaning up.

Jon.