libstrat: fix compilation without pre-compiled header/without lto

libraries/libstratosphere/include/stratosphere/ncm/ncm_content_manager_impl.hpp

@@ -51,6 +51,7 @@ namespace ams::ncm {
             }
 
             virtual void DeallocateImpl(void *buffer, size_t size, size_t alignment) override {
+                AMS_UNUSED(size, alignment);
                 return this->allocator.Free(buffer);
             }