Since pam_get_authtok(3) doesn't know about our options structure, setting the PAM_ECHO_PASS option on-the-fly is a NOP (though it wasn't with the old pam_get_pass(3) code).  Instead, call pam_prompt(3) directly.  This actually simplifies the code a bit.
Since pam_get_authtok(3) doesn't know about our options structure, setting
the PAM_ECHO_PASS option on-the-fly is a NOP (though it wasn't with the
old pam_get_pass(3) code).  Instead, call pam_prompt(3) directly.  This
actually simplifies the code a bit.

MFC after:	3 days

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase