mutt: Switch from tokyo-cabinet to kyoto-cabinet.

via http://fallabs.com/tokyocabinet/:
"BTW, do you know Kyoto Cabinet? Actually, it is more powerful and convenient
library than Tokyo Cabinet. At this distance of time, Kyoto Cabinet surpasses
Tokyo Cabinet in every aspects. I strongly recommend you to use Kyoto Cabinet."

Also, builds with xcode 5.1 as a bonus.

Signed-off-by: Evan McClain <aeroevan@gmail.com>