libstrat: enable -Wextra, -Werror

This caught an embarrassingly large number of bugs.

libraries/libstratosphere/source/sf/cmif/sf_cmif_domain_service_object.cpp

@@ -160,6 +160,8 @@ namespace ams::sf::cmif {
     }
 
     void DomainServiceObjectProcessor::SetOutObjects(const cmif::ServiceDispatchContext &ctx, const HipcRequest &response, ServiceObjectHolder *out_objects, DomainObjectId *selected_ids) {
+        AMS_UNUSED(ctx, response);
+
         const size_t num_out_objects = this->GetOutObjectCount();
 
         /* Copy input object IDs from command impl (normally these are Invalid, in mitm they should be set). */

libraries/libstratosphere/source/sf/hipc/sf_hipc_server_session_manager.cpp

@@ -277,6 +277,7 @@ namespace ams::sf::hipc {
 
     Result ServerSessionManager::DispatchManagerRequest(ServerSession *session, const cmif::PointerAndSize &in_message, const cmif::PointerAndSize &out_message) {
         /* This will get overridden by ... WithDomain class. */
+        AMS_UNUSED(session, in_message, out_message);
         return sf::ResultNotSupported();
     }
 

libraries/libstratosphere/source/sf/sf_default_allocation_policy.cpp

@@ -70,10 +70,12 @@ namespace ams::sf {
         constinit DefaultAllocatorImpl g_default_allocator_impl = {};
 
         inline void *DefaultAllocate(size_t size, size_t align) {
+            AMS_UNUSED(align);
             return ::operator new(size, std::nothrow);
         }
 
         inline void DefaultDeallocate(void *ptr, size_t size, size_t align) {
+            AMS_UNUSED(size, align);
             return ::operator delete(ptr, std::nothrow);
         }