[PackageModel] Inject swift-testing flags only if toolchain is target… #7920
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…ting macOS
Motivation:
Fixes a bug where swift and linker flags for swift-testing were injected into
extraFlags
of a toolchain that was targeting WASM but used macOS to build.Modifications:
#if os(macOS)
withif triple.isMacOSX
while deriving swift-testing flags for a toolchain.Result:
Resolves: #7919
Resolves: rdar://134714404