globally visible.

Document the fact that DEFAULT_TMP_DIR cannot be overridden
from the default configuration (this needs to be fixed, as you
could have a totally different spooldir configured at runtime,
and yet DEFAULT_TMP_DIR keeps the compile-time default).

Remove two unused entries for sounds and images.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@93581 65c4cc65-6c06-0410-ace0-fbb531ad65f3