QNX: Enabled ALSA support

If ALSA version >=1.0.10 is available on QNX it will be used by QAudio
classes. In Qt5 this is enabled already.

Change-Id: Ia4e3952ee147eaf78be7cec3c8a9fcfc97da332c
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>