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

libraries/libstratosphere/include/stratosphere/fssystem/buffers/fssystem_file_system_buddy_heap.hpp

@@ -97,6 +97,8 @@ namespace ams::fssystem {
 
             Result Initialize(uintptr_t address, size_t size, size_t block_size, s32 order_max, void *work, size_t work_size) {
                 AMS_ASSERT(work_size >= QueryWorkBufferSize(order_max));
+                AMS_UNUSED(work_size);
+
                 const auto aligned_work = util::AlignUp(reinterpret_cast<uintptr_t>(work), alignof(PageList));
                 this->external_free_lists = reinterpret_cast<PageList *>(aligned_work);
                 return this->Initialize(address, size, block_size, order_max);

libraries/libstratosphere/include/stratosphere/fssystem/buffers/fssystem_file_system_buffer_manager.hpp

@@ -178,10 +178,12 @@ namespace ams::fssystem {
                     AttrInfo *FindAttrInfo(const BufferAttribute &attr);
 
                     s32 GetCacheCountMin(const BufferAttribute &attr) {
+                        AMS_UNUSED(attr);
                         return this->cache_count_min;
                     }
 
                     size_t GetCacheSizeMin(const BufferAttribute &attr) {
+                        AMS_UNUSED(attr);
                         return this->cache_size_min;
                     }
             };