Added time.h include in redis-cli.

redis-cli.c uses the time() function to seed the PRNG, but time.h was
not included. This was not noticed since sys/time.h is included and was
enough in most systems (but not correct). With Ubuntu 12.04 GCC
generates a warning that made us aware of the issue.

src/redis-cli.c

@@ -35,6 +35,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <time.h>
 #include <ctype.h>
 #include <errno.h>
 #include <sys/stat.h>