Support Require Only App-Extension-Safe API

[yutae]

Support Require Only App-Extension-Safe API

Hi 😄 .

I found a warning while developing my today extension app.
This warning only occurs when using Carthage. (cocoapods is fine.)

warning: Linking against a dylib which is not safe for use in application extensions: /Carthage/Build/iOS/Lottie.framework/Lottie

I set iOS macOS tvOS targets Require Only App-Extension-Safe API build setting to Yes and then the build succeeded.
(macOS build succeeded with #880)

For more information, please refer to Apple document

To configure an app extension target to use an embedded framework, set the target’s "Require Only App-Extension-Safe API" build setting to Yes. If you don’t, Xcode reminds you to do so by displaying the warning "linking against dylib not safe for use in application extensions".