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* Version 4.1.9.
+ Avoid warnings from gcc.
+ * src/dd.c: Declare input_file and output_file to be `const'.
+ (skip): Declare `file' parameter to be `const', too.
+
Remove hash table, active_dir_map, used to detect directory cycles.
Instead, detect them lazily with just O(1) memory.
Suggestion from Andi Kleen.