Replace deprecated alDopplerVelocity with alSpeedOfSound per OpenAL 1.1 spec

code/client/qal.c

@@ -84,6 +84,7 @@ LPALGETBUFFERF qalGetBufferf;
 LPALGETBUFFERI qalGetBufferi;
 LPALDOPPLERFACTOR qalDopplerFactor;
 LPALDOPPLERVELOCITY qalDopplerVelocity;
+LPALSPEEDOFSOUND qalSpeedOfSound;
 LPALDISTANCEMODEL qalDistanceModel;
 
 LPALCCREATECONTEXT qalcCreateContext;
@@ -202,6 +203,7 @@ qboolean QAL_Init(const char *libname)
 	qalGetBufferi = GPA("alGetBufferi");
 	qalDopplerFactor = GPA("alDopplerFactor");
 	qalDopplerVelocity = GPA("alDopplerVelocity");
+	qalSpeedOfSound = GPA("alSpeedOfSound");
 	qalDistanceModel = GPA("alDistanceModel");
 
 	qalcCreateContext = GPA("alcCreateContext");
@@ -301,6 +303,7 @@ void QAL_Shutdown( void )
 	qalGetBufferi = NULL;
 	qalDopplerFactor = NULL;
 	qalDopplerVelocity = NULL;
+	qalSpeedOfSound = NULL;
 	qalDistanceModel = NULL;
 
 	qalcCreateContext = NULL;