[boost] [iostreams] fix cw link errors

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-11-28 03:17:54

I've committed the attached patch to fix a couple of link failures of
iostreams tests on cw. Two tests, instead of linking to the library, just
compile in some source files. At the same time, the tests managed to set
BOOST_IOSTREAMS_DYN_LINK -- therefore adding dllimport to all declarations.
The compiled-in source had no dllexport. MSVC seems to be forgiving in this
situation, but cw is not.

I'm 95% this change will fix those two errors, but if somebody thinks the
change is wrong -- shout.

- Volodya