Change bogus extern inline' to static inline'.

This finishes making the kernel compile without -O.

The "optimized" asm version of the function being inlined
(translate_bytes()) uses slow instructions.  On a 486, assuming
everything is in the cache (unlikely), it is 21/15 times slower
than the dumb C version and 21/3 times slower than the best
possible bytewise method.

sys/i386/isa/sound/audio.c

@@ -149,7 +149,7 @@ translate_bytes (const unsigned char *table, unsigned char *buff, unsigned long
 }
 
 #else
-extern inline void
+static inline void
 translate_bytes (const void *table, void *buff, unsigned long n)
 {
   __asm__ ("cld\n"