add missing import for Linux

Author: pjechris

Sources/SimpleHTTPFoundation/Foundation/URLRequest/URLRequest+URL.swift

@@ -1,5 +1,9 @@
 import Foundation
 
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
+
 extension URLRequest {
     /// Return a new URLRequest whose path is relative to `baseURL`
     public func relativeTo(_ baseURL: URL) -> URLRequest {

Sources/SimpleHTTPFoundation/Foundation/URLSession+Async.swift

@@ -1,5 +1,9 @@
 import Foundation
 
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
+
 extension URLSession {
     @available(iOS, deprecated: 15.0, message: "Use built-in API instead")
     public func data(for urlRequest: URLRequest) async throws -> (Data, URLResponse) {