Only activate QSA detection on QNX systems and let it block ALSA detection.
Only activate QSA detection on QNX systems and let it block ALSA detection.

I had QSA trying to build on my Linux system because of ALSA headers being there ...


git-svn-id: 793bb72743a407948e3701719c462b6a765bc435@3267 35dc7657-300d-0410-a2e5-dc2837fedb53

Distrotech/mpg123,Distrotech/mpg123,Distrotech/mpg123,Distrotech/mpg123,Distrotech/mpg123,Distrotech/mpg123,Distrotech/mpg123