Boost ports update

[Alexander Churanov]

Folks,

There is good news: editors/koffice-kde4 builds successfully with Boost 1.48.
It was failing in my tests because of conflict with qt33.

The only dependent port left that fails after update to 1.48 is
deskutils/kdepim4. For others we either have fixes or a plan how to
cope with failures.

I am going to find out what makes kdepim4 fail, then fix Boost for
amd64 and submit an updated patch after that.

Alexander Churanov,
maintainer of devel/boost-*