buildenv/1.2.x/win32: remove old bzip2 dll patch.
buildenv/1.2.x/win32: actually use new bzip2 dll+pdb patch.
buildenv/1.2.x/win32: ensure Ice import libs live in lib/vc100 for backwards compatibility with the ZeroC binary packages.
buildenv/1.2.x/win32: ensure libsndfile's import lib is available as libsndfile-1.lib for backwards compatibility with the official binary package.