Realm-cocoa: Warn developers about the perils of misplaced build phases when building with Carthage

[Bogidon]

I wasted many hours trying to fix this error:

It turns out that I had placed the Run Script phase above my Embed Frameworks phase in my watchOS target. It's a silly mistake, but it's easy enough to make and potentially annoying to debug. (Applications... require an iOS Development Target of 3.0 or later really? )

I think it would be useful to warn developers about this. I suggest an addition like this to the docs (my contribution is the section in yellow):

I would submit a PR, but I think the docs might not be on GitHub?

[Bogidon]

Tagging so devs can find this solution in the future.

• ITMS-90081: This bundle is invalid. Applications built for more than one architecture require an iOS Deployment Target of 3.0 or later.
• ITMS-90209: Invalid Segment Alignment. The app binary at __ does not have proper segment alignment. Try rebuilding the app with the latest Xcode version.
• ITMS-90125: The binary is invalid. The encryption info in the LC_ENCRYPTION_INFO load command is either missing or invalid, or the binary is already encrypted. This binary does not seem to have been built with Apple's linker.

[jpsim]

Thanks for the suggestion, I updated our installation steps to emphasize this. It should be live in a few minutes.

[Bogidon]

Great! :smile: