Better altivec cvar handling. Should fix crashes at startup, or curious

people that toggle it on at runtime on a G3.

code/win32/win_main.c

@@ -1176,6 +1176,13 @@ void Sys_Init( void ) {
 }
 
 
+qboolean Sys_DetectAltivec( void )
+{
+    return qfalse;  // never altivec on Windows...at least for now.  :)
+}
+
+
+
 //=======================================================================
 
 int	totalMsec, countMsec;