HCOLL-194 Add I24 -> I24 multimap.

src/test/java/net/openhft/chronicle/map/IntIntMultiMapTest.java

@@ -55,6 +55,7 @@ public class IntIntMultiMapTest {
     public static Collection<Object[]> data() {
         return Arrays.asList(new Object[][]{
                 {VanillaShortShortMultiMap.class},
+                {VanillaI24I24MultiMap.class},
                 {VanillaIntIntMultiMap.class},
         });
     }