fix: broken builds from Swift 5.5.0 < Swift 5.5.2 #320
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Issue Description
#278 enabled backwards compatibility of async/await functionality on iOS 13 and alike from Xcode 13.2+. This backwards compatibility isn't available on Xcode 13.0 and 13.1, preventing the Swift SDK from building on those versions of Xcode.
Related issue: #n/a
Approach
Change the Swift version check to a compiler check and only build async/await functionality on code being compiled with 5.5.2+.
Note: For some reason, Windows CI build fails to run XCTests on Swift 5.5.2. It's a known issue on Swift Windows, so I'm leaving the windows CI on 5.5.1 for now. Opened a PR to check MaxDesiatov/swift-windows-action#1
TODOs before merging