Fix build warnings

In preparation for the port to meson, fix some build warnings.

Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
Change-Id: Id91856785ed71a29599bd1b9cd19d8b4db31c2be
diff --git a/include/error_monitors.hpp b/include/error_monitors.hpp
index 80332b0..def14d5 100644
--- a/include/error_monitors.hpp
+++ b/include/error_monitors.hpp
@@ -36,8 +36,9 @@
 }
 
 // Start the signal monitors
-bool startMonitors(boost::asio::io_context& io,
-                   std::shared_ptr<sdbusplus::asio::connection> conn)
+bool startMonitors(
+    [[maybe_unused]] boost::asio::io_context& io,
+    [[maybe_unused]] std::shared_ptr<sdbusplus::asio::connection> conn)
 {
     // smiMonitor =
     // std::make_unique<host_error_monitor::smi_monitor::SMIMonitor>(