iOS 6 + Mobile SDK 2.1.3 RC: Missing required architecture armv6

I installed the 2.1.3 RC SDK today, wanting to update my app to support the iPhone 5 as soon as possible. Everything went okay (or almost :p), except for the very last step, verification of the archive prior to uploading to the app store.

It's giving me one error: "At least one of the following architectures must be present: armv6". http://d.pr/i/QXg9

I've tried building from Xcode too, to see if it was giving me the same error; it did. I search the internets and found that this is the most common solution: http://stackoverflow.com/questions/7053466/application-executable-is-missing-a-required-architecture-armv6, but it doesn't resolve my problem either. (I must have tried like 15 times, so...)

This must be related to the unstability of the SDK, but I'd like to know if there are any workarounds that might help me release faster (not that it really matters).

Thanks :)