Simplify minimum deployment target on Darwin platforms (still requiring macOS 10.15+, adding iOS 13+) #3557
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Simplify the deployment targets on Darwin platforms, setting the minimum deployment target to macOS 10.15 and iOS 13 or later on Darwin platforms. The environment variables were needed during a transitional phase, and SwiftPM already required macOS 10.15 or later on macOS. Note that non-Darwin platforms are unaffected.
Motivation:
This simplifies the logic while keeping the same macOS 10.15 dependency, and aligns SwiftPM with the ToolsSupportCore requirements in swiftlang/swift-tools-support-core#225.
See comment in #3552 (comment)
Modifications:
Set macOS 10.15 and iOS 13 as minimum deployment targets.
Result:
No change for macOS, v13 required for iOS.