Move MAX_SND_VOICES to header file (#158)

Author: 1011X

gc/asndlib.h

@@ -47,6 +47,8 @@ THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 extern "C" {
 #endif
 
+#define MAX_SND_VOICES			16
+
 /*! \addtogroup sndretvals SND return values
  * @{
  */

libasnd/asndlib.c

@@ -39,7 +39,6 @@ THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #undef SND_BUFFERSIZE
 
-#define MAX_SND_VOICES			16
 #define SND_BUFFERSIZE			(4096) // don't modify this value
 
 #define VOICE_UPDATEADD   (1<<12)