patch 9.0.0800: compiler complains about repeated typedef

Problem:    Compiler complains about repeated typedef.
Solution:   Remove one typedef.

src/sound.c

@@ -17,7 +17,7 @@
 
 static long	    sound_id = 0;
 
-typedef struct soundcb_S soundcb_T;
+// soundcb_T is typdef'ed in proto/sound.pro
 
 struct soundcb_S {
     callback_T	snd_callback;

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    800,
 /**/
     799,
 /**/