meson: Address warnings for switching autoconf to meson

This commit addresses the compilation warnings when switching autoconf
to meson.

Tested: Build passes with CIT and "ninja -C build".

Change-Id: Ieda04b856f4fd24de867c3eaee8b9c4a9b333aaf
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/settings_main.cpp b/settings_main.cpp
index 78a0ebe..abc28c5 100644
--- a/settings_main.cpp
+++ b/settings_main.cpp
@@ -5,7 +5,7 @@
 #include <sdbusplus/bus.hpp>
 #include <sdbusplus/server/manager.hpp>
 
-int main(int argc, char* argv[])
+int main([[maybe_unused]] int argc, [[maybe_unused]] char* argv[])
 {
     auto bus = sdbusplus::bus::new_default();