Wrong Qbs architecture with linux-g++-32 kit on a linux-g++-64 host

When creating a project with Qbs as build system, and choosing a linux+g++32 based kit in the project's "Build & Run" settings. Qbs will build with "-m64" compiler flags instead of (-m32).

Current workaround is to add "qbs.architecture" to "x86" in the Qbs specifics of the Kit.

Initially reported on QtC and Qbs mailing list:

http://lists.qt-project.org/pipermail/qt-creator/2017-September/006706.html

http://lists.qt-project.org/pipermail/qbs/2017-September/001816.html