illumos gate

The pam_start(3PAM) manpage gives the prototype of the pam conversation function as:

     int conv(int num_msg, const struct pam_message **msg,
                struct pam_response **resp, void *appdata_ptr);

however, the actual definition in /usr/include/security/pam_appl.h is:

        int (*conv)(int, struct pam_message **,
            struct pam_response **, void *);

where the second argument is not const. We should make the two agree. For reference, I believe the Linux pam implementations define the second parameter as const, however that should not be taken as advice as to which entity to be modified to match the other.