fatal error: 'co_queue.h' file not found

### Context and Description

### Environment Details

* coobjc version: 1.2.0
* iOS version: iOS14.2
* Xcode version: xcode12.2
* Other informations: pod 'coobjc', '1.2.0'

### Expected behavior

zip里面的cocore在coobjc里面，所以#import “”没问题，但是pod下来的cocore在另一个target里面，应该采取#import<> 也许就不会报错了

### Actual behavior

### Steps to Reproduce

### method call stacks

No source file or test is named. Reproduce the coobjc 1.2.0 CocoaPods setup in Xcode 12.2 on iOS 14.2, then inspect how the pod target exposes co_queue.h and how it is imported; done means the pod consumer builds without the missing-header error.

Written by the indexing model from the issue text.