fix compile issue

Author: WZhuo

src/iceberg/manifest/manifest_list.h

@@ -275,7 +275,7 @@ ICEBERG_EXPORT inline constexpr Result<ManifestContent> ManifestContentFromStrin
 
 namespace std {
 template <>
-struct std::hash<iceberg::ManifestFile> {
+struct hash<iceberg::ManifestFile> {
   size_t operator()(const iceberg::ManifestFile& manifest_file) const {
     return std::hash<std::string>{}(manifest_file.manifest_path);
   }

src/iceberg/table_scan.h

@@ -356,7 +356,7 @@ class ICEBERG_EXPORT DataTableScan : public TableScan {
 /// \brief A base template class for incremental scans that read changes between
 /// snapshots, and return scan tasks of the specified type.
 template <typename ScanTaskType>
-class ICEBERG_EXPORT IncrementalScan : public TableScan {
+class IncrementalScan : public TableScan {
  public:
   ~IncrementalScan() override = default;