Apart from dependency on native-code DLLs, the one other quirk of
running WiX under mono is that it doesn't seem to quite get the right
answers when combining $PWD with a Unix absolute path to one of its
own supporting files - it doesn't interpret the leading slash on the
latter as meaning $PWD should be ignored, so it tries to look for
/home/my/build/dir/home/my/wix/install/dir/some.file. Previously I was
bodging around that by having my build dir contain a symlink 'home'
pointing at /home; this is marginally less intrusive.
