Android: Fix build path with non-latin characters

androiddeployqt uses toLocal8Bit() to get the correct
encoding for executing shell commands, which is broken when
Creator sets the process locale to something different from
the shell. This caused build failures for all users on systems
where the default build path is translated to something which
contains non-latin characters.

Task-number: QTBUG-34316
Change-Id: I4e7dd0d3351d164b720f042bb21f668589df5527
Reviewed-by: Daniel Teske <daniel.teske@digia.com>