Emit target_os = ...
cfgs on framework dependencies
#618
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Framework crates like
objc2-app-kit
cannot be used on e.g. tvOS, and neither can the functionality that depend on types from that crate. This is also problematic for GNUStep.This is similar to (and lays some of the groundwork for) #433, but distinct in that the cfgs are only emitted when a dependency is required, not for all items.