Using the architecture field from native packages

We used to assume that a native package had an arch type of '*' (i.e.
it would always be compatible with everything).

However, on a mixed 32 and 64 bit platform, we can't use a 64-bit
native library with a downloaded 32-bit implementation. I've changed
the code to record the type for x86_64 packages so that they won't be
selected in combination with 32-bit implementations:

http://repo.or.cz/w/zeroinstall.git?a=commit;h=a1980f1fd207d171d480049a1890ffdb0f72ed02

We might need a similar change for RPMs too. Patches welcome...

--

-- 
Dr Thomas Leonard	ROX desktop / Zero Install
GPG: 9242 9807 C985 3C07 44A6 8B9A AE07 8280 59A5 3CC1

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