Code review comment for lp:~jameinel/bzr/2.1-remove-win32-build

This removes some of the win32 build cruft from the bzr codebase. Unfortunately I cannot (yet) remove all of it, because a decent portion of the build process still uses the code from here. (Namely we run 'iscc bzr.iss' on the file from the bzr source, rather than using that file from bzr-windows-installers. This should get fixed.

In the short term, this at least is a small reduction in random stuff in the bzr codebase. It also helps force the bzr-windows-installers project not to expect to find certain files in the bzr code, rather than looking in the installers code.