LibCore: Use accept instead of accept4 on Haiku

Author: https://github.com/ghost
Commit: 0816bbe727
Pull-request: https://github.com/SerenityOS/serenity/pull/20808
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/Hendiadyoin1
Reviewed-by: https://github.com/diversys

Userland/Libraries/LibCore/System.h

@@ -105,7 +105,7 @@ ErrorOr<Optional<struct spwd>> getspent();
 ErrorOr<Optional<struct spwd>> getspnam(StringView name);
 #endif
 
-#ifndef AK_OS_MACOS
+#if !defined(AK_OS_MACOS) && !defined(AK_OS_HAIKU)
 ErrorOr<int> accept4(int sockfd, struct sockaddr*, socklen_t*, int flags);
 #endif