Use granular RetroactiveAttribute feature guard (#359)

### Motivation To protect against corner-cases where the more coarse compiler guard is insufficient. ### Modifications Use granular `RetroactiveAttribute` feature guard ### Result Safer code building. ### Test Plan Tested code building with 5.8 on Linux
apple · Nov 1, 2023 · 893b3db · 893b3db
1 parent 2081703
commit 893b3db
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diff --git a/Sources/_OpenAPIGeneratorCore/Extensions/Foundation.swift b/Sources/_OpenAPIGeneratorCore/Extensions/Foundation.swift
@@ -13,7 +13,7 @@
 //===----------------------------------------------------------------------===//
 import Foundation
 
-#if compiler(>=5.11)
+#if hasFeature(RetroactiveAttribute)
 extension FileHandle: @retroactive TextOutputStream {}
 #else
 extension FileHandle: TextOutputStream {}

diff --git a/Sources/swift-openapi-generator/Extensions.swift b/Sources/swift-openapi-generator/Extensions.swift
@@ -16,7 +16,7 @@ import ArgumentParser
 import _OpenAPIGeneratorCore
 import Yams
 
-#if compiler(>=5.11)
+#if hasFeature(RetroactiveAttribute)
 extension URL: @retroactive ExpressibleByArgument {}
 extension GeneratorMode: @retroactive ExpressibleByArgument {}
 extension FeatureFlag: @retroactive ExpressibleByArgument {}