Fix FTBFS with clang++

Forwarded from http://bugs.debian.org/757820

common/memops.c

@@ -198,7 +198,7 @@ static inline __m128i float_24_sse(__m128 s)
  */
 static unsigned int seed = 22222;
 
-inline unsigned int fast_rand() {
+static inline unsigned int fast_rand() {
 	seed = (seed * 96314165) + 907633515;
 	return seed;
 }