Android: Make qmake.conf usable for getting arch in Qt Creator

Qt Creator needs to parse the qmake.conf in order to get the
architecture for this Qt build when the Qt build is added.
At this point it does not know that it's reading an android
project, so it can't set the right environment variables. By
moving the error to the bottom, we let Creator parse the whole
file before getting an error, so that it can detect the options
it needs to define the Qt version.

Change-Id: I119523cb21e330dc5e957a6992476c4c3d4ab7b5
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Stabilize tst_qmenubar.

The test was re-using a main window and menu bars for all tests,
clearing and repopulating them. Rewrite the code to be able to
use menu bars and windows on the stack separately for each test.

Change-Id: I13ab31b26b70bc8537e8d8ab164051b3197cd68e
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>