os: implement Tick api, make build with -Werror

libraries/libstratosphere/include/stratosphere/os.hpp

@@ -18,6 +18,7 @@
 
 #include "os/os_common_types.hpp"
 #include "os/os_memory_common.hpp"
+#include "os/os_tick.hpp"
 #include "os/os_managed_handle.hpp"
 #include "os/os_process_handle.hpp"
 #include "os/os_random.hpp"