Fix compile issue when basic auth is disabled

This adds the appropriate [[maybe_unused]] flag to fix the compile
issue.

Tested:
EXTRA_OEMESON:pn-bmcweb:append = "-Dbasic-auth='disabled'"
put into a local.conf now compiles properly.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ifcc55c2d903017394a2f728a4340a007e3e8d7dc
diff --git a/include/authorization.hpp b/include/authorization.hpp
index ecc83fc..7caa09a 100644
--- a/include/authorization.hpp
+++ b/include/authorization.hpp
@@ -256,8 +256,8 @@
 }
 
 static std::shared_ptr<persistent_data::UserSession> authenticate(
-    std::string_view url, boost::asio::ip::address& ipAddress, Response& res,
-    boost::beast::http::verb method,
+    std::string_view url, boost::asio::ip::address& ipAddress [[maybe_unused]],
+    Response& res, boost::beast::http::verb method,
     const boost::beast::http::header<true>& reqHeader,
     [[maybe_unused]] const std::shared_ptr<persistent_data::UserSession>&
         session)