Include redis.h before other stuff in hyperloglog.c.

Otherwise fmacros.h is included later and this may break compilation on
different systems.

src/hyperloglog.c

@@ -29,9 +29,10 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "redis.h"
+
 #include <stdint.h>
 #include <math.h>
-#include "redis.h"
 
 /* The Redis HyperLogLog implementation is based on the following ideas:
  *