Always use rawValue when using OS enum as string

Certain enum cases, such as `freeBSD`, contain capital letters. However, target triples must be entirely in lower case. The enum case's raw value reflects this, but our custom initializer for the Triple structure does not use it, resulting in an invalid target triple. This makes the generated SDK unusable if the user passed only the desired architecture instead of a complete triple.

To address this problem, the initializer should always request the rawValue explicitly.

Author: CodingCarpincho

Sources/SwiftSDKGenerator/PlatformModels/Triple.swift

@@ -18,10 +18,12 @@ extension Triple: @unchecked Sendable {}
 
 extension Triple {
   public init(arch: Arch, vendor: Vendor?, os: OS, environment: Environment) {
+    let os = os.rawValue
     self.init("\(arch)-\(vendor?.rawValue ?? "unknown")-\(os)-\(environment)", normalizing: true)
   }
 
   public init(arch: Arch, vendor: Vendor?, os: OS) {
+    let os = os.rawValue
     self.init("\(arch)-\(vendor?.rawValue ?? "unknown")-\(os)", normalizing: true)
   }
 }