Increase the default msgbuf size from 8k to 32k.  Boot -v easily overflows the default buffer making it too hard to get a dmesg from a verbose boot.  It's still changeable via an option, so if picobsd needs to set it to something else they still can.
Increase the default msgbuf size from 8k to 32k.  Boot -v easily
overflows the default buffer making it too hard to get a dmesg from
a verbose boot.  It's still changeable via an option, so if picobsd
needs to set it to something else they still can.

Reviewed by:	phk, alfred

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