boost soname bump

[Bruno Wolff III]

On Sun, Nov 20, 2011 at 08:05:34 -0600,
  Bruno Wolff III <bruno at wolff.to> wrote:
> It looks like there was a soname bump in boost yesterday. Boost affects
> enough stuff, that there really should have been a heads up message posted to
> the devel list about this.

It looks like there may have been a semantic change in how BOOST_FOREACH
is used. The upstream docs for it don't seem to have changed, but wesnoth
isn't rebuilding today. gcc hasn't changed since the last successful
build of Wesnoth, so it is likely to be due to the boost change.