add missing iceberg_export.h (#48)

Signed-off-by: Junwang Zhao <[email protected]>

Author: zhjwpku

src/iceberg/exception.h

@@ -28,6 +28,8 @@
 
 #include <stdexcept>
 
+#include "iceberg/iceberg_export.h"
+
 namespace iceberg {
 
 /// \brief Base exception class for exceptions thrown by the Iceberg library.