[Openal] AL_GAIN=0 doesn't mute

[Ruben]

Hi,

> 	We're using the CVS 2003-11-26 version which is the best one of all CVS
> versions that I tested so far. My OS is Linux 2.6.4 (I tried also with

	I've also tested with current CVS and keeps having the same behaviour,
with gain 0 I can hear the sounds.

Regards.