[Click] patch for elements/wifi/linktable.hh

[Giovanni Di Stasi]

In the file I've mentioned in the subject, the copy constructor of IPPair is 
not defined const, so it doesn't work when used with HashTable.

-   operator==(IPPair other)
+  operator==(IPPair other) const

-- 
Giovanni Di Stasi, Junior Researcher
Dipartimento di Informatica e Sistemistica
Università degli Studi di Napoli "Federico II"
Via Claudio, 21 - 80125 Napoli - Italy

Phone:    +39 081 7683821
Fax:      +39 081 7683816
E-mail:   giovanni.distasi at unina.it