Fix warning with NX_DEBUG_INPUT:

NXproperty.c: In function ‘ProcChangeProperty’:
NXproperty.c:210:7: warning: implicit declaration of function ‘nxagentGuessDumpInputInfo’; did you mean ‘nxagentGuessClientHint’? [-Wimplicit-function-declaration]
       nxagentGuessDumpInputInfo(client, stuff->property, (char *) &stuff[1]);
       ^~~~~~~~~~~~~~~~~~~~~~~~~
       nxagentGuessClientHint