[boost] Typos in source (refered and prefered are used instead of referred and preferred)

From: Domenico Andreoli (cavok_at_[hidden])
Date: 2006-07-20 06:43:38

hi,

  debian user and developer Roger Leigh reported some typos in Boost
sources. i'm attaching his patch against your CVS. full debian bug
report is available at http://bugs.debian.org/378016.

please fix it before 1.34.0.

thank you
domenico

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