HEADSUP: /etc/malloc.conf format change

As a result of the recent jemalloc update, the format for /etc/malloc.conf has changed.  If your system has an old-style /etc/malloc.conf, you will want to delete it prior to installworld, and optionally re-create it using the new format after rebooting.  See malloc.conf(5) for details (specifically the TUNING section and the "opt.*" entries in the MALLCTL NAMESPACE section).

The MALLOC_OPTIONS environment variable and the _malloc_options global do not pose the same headache, because their new counterparts are named MALLOC_CONF and malloc_conf, respectively.

Jason