port from pd-l2ork git: b7a8935bfa66be555a58cb3e2a9c5b24c4142638

*forgot to update sched_tick due to a backport

pd/extra/pd~/pdsched.c

@@ -73,7 +73,7 @@ int pd_extern_sched(char *flags)
                 for (; chan < chin; chan++)
                     for (j = 0; j < DEFDACBLKSIZE; j++)
                         *fp++ = 0;
-                sched_tick(sys_time+sys_time_per_dsp_tick);
+                sched_tick();
                 sys_pollgui();
 #if defined(__linux__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__GNU__)
                 pollwatchdog();