[Vortex] gcc 4.2.1

[dexter]

Hey there,

This is just a note about the vortex_sasl_accept_negociation and 
corresponding _full function.

With gcc (GCC) 4.2.1 (Ubuntu 4.2.1-5ubuntu4), the compiler says:
  warning: deprecated conversion from string constant to ‘char*’

For this line: vortex_sasl_accept_negociation_full(VORTEX_SASL_PLAIN, this)

The char * mech parameter should be const char *
It's not a big deal, but I like my compile output warning free :)

(also note, I'm using version 1.0.11 it could be already fixed in the 
latest version)

Also note bug #329: 
http://dolphin.aspl.es/cgi-bin/bugzilla/show_bug.cgi?id=329

-
Balazs