[Qbs] QT_DEBUG defined on release builds

[Ely]

I have a project roughly specified like this:

> Project {
>     CppApplication {
>         Depends { name: "Qt.core" ... }
>         Group {
>             file: ['main.cpp']
>             cpp.defines: ['SOMETHING', 'SOMETHING_ELSE']
>         }
>    }
> }

With this setup, I get the following defines on a release build:
> -DNDEBUG -DSOMETHING -DSOMETHING_ELSE

But when the cpp.defines are not placed in a group, I get these:
> -DNDEBUG -DSOMETHING -DSOMETHING_ELSE -DQT_CORE_LIB -DQT_NO_DEBUG

This is a problem, because without QT_NO_DEBUG, all code in checking for 
QT_DEBUG compiles.

I'm using qbs 1.10.
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