Add guards for code that relies on _Concurrency to allow compilation with Xcode 13 #236
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Add extra code guards so that Xcode 13 will compile this package on macOS 11, which does not have symbols for Concurrency yet.
Motivation:
Allow compilation with Xcode 13
Modifications:
Changed code guards
#if compiler(>=5.5)
to#if compiler(>=5.5) && canImport(_Concurrency)
Got the idea from swift-server/swift-service-lifecycle#110
Result:
Successfully compiles with Xcode 13