QNX: Enabled ALSA support

If ALSA version >=1.0.10 is available on QNX it will be used by QAudio
classes.

Change-Id: Iaf9eea06daa76a8f86cee529387bc797d0af7cdc
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>