Merge pull request #120 from kkebo/stabilize-c

build: remove `CDecl` feature

Author: kkebo

Package.swift

@@ -4,7 +4,6 @@ import PackageDescription
 
 let swiftSettings: [SwiftSetting] = [
     .enableExperimentalFeature("LifetimeDependence"),
-    .enableExperimentalFeature("CDecl"),
     .enableExperimentalFeature("InlineAlways"),
     .enableUpcomingFeature("InternalImportsByDefault"),
     .enableUpcomingFeature("MemberImportVisibility"),