mesa: use rand() instead of random()

As Vinson Lee did in commit bb284669f8
in hash_table.c

Signed-off-by: Brian Paul <brianp@vmware.com>

src/mesa/main/set.c

@@ -324,7 +324,7 @@ _mesa_set_random_entry(struct set *ht,
                        int (*predicate)(struct set_entry *entry))
 {
    struct set_entry *entry;
-   uint32_t i = random() % ht->size;
+   uint32_t i = rand() % ht->size;
 
    if (ht->entries == 0)
       return NULL;