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

libraries/libstratosphere/include/stratosphere/fs/fs_remote_filesystem.hpp

@@ -53,6 +53,8 @@ namespace ams::fs {
             }
 
             virtual Result DoOperateRange(void *dst, size_t dst_size, fs::OperationId op_id, s64 offset, s64 size, const void *src, size_t src_size) override final {
+                AMS_UNUSED(src, src_size);
+
                 R_UNLESS(op_id == OperationId::QueryRange,       fs::ResultUnsupportedOperationInFileServiceObjectAdapterA());
                 R_UNLESS(dst_size == sizeof(FileQueryRangeInfo), fs::ResultInvalidSize());