* libmisc/monitor/mon-monitor.c, libmisc/monitor/mon-object.c,
libmisc/monitor/monitor.h, libmisc/shell/main_chmod.c,
libmisc/shell/main_tty.c, libmisc/shell/main_umask.c,
libmisc/shell/main_whoami.c: Add pthread command to monitor when
POSIX is enabled. Remove include of rtems/monitor.h from files not
related.