If we are configuring on IRIX, check for the SGI Audio library before checking for SL.  SL will not work without this library on IRIX.
If we are configuring on IRIX, check for the SGI Audio library before
checking for SL.  SL will not work without this library on IRIX.


git-svn-id: 769d22dfa2d22aad706b9a451492fb87c0735f19@2101 08b38cba-cd3b-11de-854e-f91c5b6e4272

MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,MichaelMcDonnell/vrjuggler,vancegroup-mirrors/vrjuggler,vrjuggler/vrjuggler,vrjuggler/vrjuggler,MichaelMcDonnell/vrjuggler,godbyk/vrjuggler-upstream-old,MichaelMcDonnell/vrjuggler,vrjuggler/vrjuggler,LiuKeHua/vrjuggler,MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,vrjuggler/vrjuggler,vrjuggler/vrjuggler,MichaelMcDonnell/vrjuggler,LiuKeHua/vrjuggler,vrjuggler/vrjuggler,godbyk/vrjuggler-upstream-old,vancegroup-mirrors/vrjuggler,godbyk/vrjuggler-upstream-old,godbyk/vrjuggler-upstream-old,LiuKeHua/vrjuggler,vancegroup-mirrors/vrjuggler,LiuKeHua/vrjuggler,MichaelMcDonnell/vrjuggler,godbyk/vrjuggler-upstream-old,vrjuggler/vrjuggler,vancegroup-mirrors/vrjuggler,godbyk/vrjuggler-upstream-old,LiuKeHua/vrjuggler,vrjuggler/vrjuggler,LiuKeHua/vrjuggler,MichaelMcDonnell/vrjuggler,vancegroup-mirrors/vrjuggler,vancegroup-mirrors/vrjuggler