Remove SSHv1 code path.

Server-side support for Protocol 1 has been removed so remove !compat20
PAM code path.

auth-pam.c

@@ -106,7 +106,6 @@ extern char *__progname;
 
 extern ServerOptions options;
 extern Buffer loginmsg;
-extern int compat20;
 extern u_int utmp_len;
 
 /* so we don't silently change behaviour */
@@ -468,7 +467,6 @@ sshpam_thread(void *ctxtp)
 	if (sshpam_err != PAM_SUCCESS)
 		goto auth_fail;
 
-	if (compat20) {
 	if (!do_pam_account()) {
 		sshpam_err = PAM_ACCT_EXPIRED;
 		goto auth_fail;
@@ -480,7 +478,6 @@ sshpam_thread(void *ctxtp)
 			goto auth_fail;
 		sshpam_password_change_required(0);
 	}
-	}
 
 	buffer_put_cstring(&buffer, "OK");