qmake generates wrong msvc project

Since `-utf-8` option was added for msvc in commit
015b53e9b4091c28b8a2d7931788 "Turn on -utf-8 compiler option for msvc2015 update 2 and up"
The problem is that `-utf-8` option is parsed as '\u' by qmake which happens to be `UndefineAllPreprocessorDefinitions` which leads to undefining of all important defintions such as `_MSC_VER` or `_WIN64` and every program fails to compile. Also I think `-utf-8` should also appear in `AdditionalOptions`.