[racket] speeding up db.plt loading

From: Neil Van Dyke (neil at neilvandyke.org)
Date: Sun Sep 2 15:22:49 EDT 2012

A newer version of "db" is now in core Racket, so you don't have to get 
it from PLaneT.

If you instead try the following, is that sufficiently fast:

(require db/base db/sqlite3)

Neil V.

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