* pppd/Makefile.am: Use mkdir_p. Remove dirs from PRE/TMPINSTALL_FILES.
* rtems_servers/Makefile.am: Use mkdir_p. Remove dirs from PRE/TMPINSTALL_FILES.
* rtems_telnetd/Makefile.am: Use mkdir_p. Remove dirs from PRE/TMPINSTALL_FILES.
* rtems_webserver/Makefile.am: Use mkdir_p. Remove dirs from PRE/TMPINSTALL_FILES.