Add missing include
Fix by rick <rick@gnous.eu>
https://github.com/simsong/bulk_extractor/issues/491

--- a/src/exif_entry.h
+++ b/src/exif_entry.h
@@ -3,7 +3,7 @@
 
 #include <vector>
 #include <memory>
-
+#include <cstdint>
 
 
 /**