moved chunk_increment() function to libstrongswan

src/libstrongswan/chunk.h

@@ -238,6 +238,14 @@ static inline bool chunk_equals(chunk_t a, chunk_t b)
 			a.len == b.len && memeq(a.ptr, b.ptr, a.len);
 }
 
+/**
+ * Increment a chunk, as it would reprensent a network order integer.
+ *
+ * @param chunk			chunk to increment
+ * @return				TRUE if an overflow occured
+ */
+bool chunk_increment(chunk_t chunk);
+
 /**
  * Check if a chunk has printable characters only.
  *