[FileReferencesInstaller] Add build headers

[mrackwitz]

Built frameworks require still private and build headers to be linked in the pod target support files' header directory.

• Verify doesn't regress [FileReferencesInstaller] Dont create build headers for frameworks #4476

[segiddins]

This basically reverts #4476 -- please verify this isn't a regression for the linked-to issue

[mrackwitz]

Oh right, thanks for the reference again. I’ll try to properly reproduce the original issue but with the latest Xcode version.

[neonichu]

Just for context as the original issue is very long: this was due to a change in swiftc, so make sure to test with a Swift project.

[mrackwitz]

@neonichu: Good point, saw that as well. But I think I could reproduce it already independent from swiftc 😕, given that podspecs should never need to define CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES=YES itself as some concerned podspecs (FBSDKCoreKit, etc.) do that. If I remove it manually from the xcconfig, they break with this change. If I remove the HEADER_SEARCH_PATHS, then they build again.

[segiddins]

@mrackwitz this'll need a rebase before merging

[segiddins]

@mrackwitz is this still something that needs to happen?

[mrackwitz]

No, it seems like this would be a regression.

[reduxdj]

CocoaPods 1.0.0.beta.6 is available.
To update use: gem install cocoapods --pre
[!] This is a test version we'd love you to try

Yep I tried and I still can't get the realm library to work.
Can you give me some guidance please?