remove dead code from conversion unittest

this code was here to test that some type combinations as arguments to
operators do not work. It was disabled long ago and doesn't work in this
way - so remove it.

Signed-off-by: Matthias Kretz <kretz@kde.org>
warnings: warn about unused functions and typedefs

There are users out there who want to have these warnings enabled and
include Vc with -I instead of -isystem. Whatever. I liked to have the
typedefs around, but it shouldn't be much work to readd them when needed
again. So I removed all unused typedefs.

Signed-off-by: Matthias Kretz <kretz@kde.org>