Shadow build default directories make no sense for android projects

With clean settings and newly added Qt 5.3.2 for android I always get "build--" as default shadow build folder for android projects. This of course leads to funny problems if you have more than one android project and don't watch the shadow build path.

It actually succeeds in building and running the application, so I guess the pattern from which the path is constructed needs some love. Android kit names are automatically created from Qt versions and are rather verbose. In my case "Android for armeabi (GCC 4.8, Qt 5.3.2)" and "Android for armeabi-v7a (GCC 4.8, Qt 5.3.2)"