wpa_gui-qt4: compiler warnings

[Kel Modderman]

Hi Jouni,

fyi, a couple of compiler warnings are emitted on my system (g++ 4.3.2):

networkconfig.cpp: In member function 'virtual void NetworkConfig::addNetwork()':
networkconfig.cpp:313: warning: deprecated conversion from string constant to 'char*'
networkconfig.cpp:318: warning: deprecated conversion from string constant to 'char*'
networkconfig.cpp: In member function 'virtual void NetworkConfig::paramsFromConfig(int)':
networkconfig.cpp:647: warning: deprecated conversion from string constant to 'char*'

Thanks, Kel.