libstrat: enable -Wextra, -Werror

This caught an embarrassingly large number of bugs.

libraries/libstratosphere/source/htc/server/rpc/htc_rpc_tasks.hpp

@@ -88,18 +88,22 @@ namespace ams::htc::server::rpc {
             }
 
             virtual Result ProcessResponse(const char *data, size_t size) {
+                AMS_UNUSED(data, size);
                 return ResultSuccess();
             }
 
             virtual Result CreateRequest(size_t *out, char *data, size_t size, u32 task_id) {
+                AMS_UNUSED(out, data, size, task_id);
                 return ResultSuccess();
             }
 
             virtual Result ProcessNotification(const char *data, size_t size) {
+                AMS_UNUSED(data, size);
                 return ResultSuccess();
             }
 
             virtual Result CreateNotification(size_t *out, char *data, size_t size, u32 task_id) {
+                AMS_UNUSED(out, data, size, task_id);
                 return ResultSuccess();
             }