if compile with vs2015, enable the "static inline" declare.

linkhash.h

@@ -332,7 +332,14 @@ int lh_table_resize(struct lh_table *t, int new_size);
  * @param k a pointer to the key to lookup
  * @return the key's hash
  */
+#if !defined(_MSC_VER) || (_MSC_VER > 1800)
+static inline unsigned long lh_get_hash(const struct lh_table *t, const void *k)
+{
+	return t->hash_fn(k);
+}
+#else
 unsigned long lh_get_hash(const struct lh_table *t, const void *k);
+#endif
 
 /* Don't use this outside of linkhash.h: */
 #ifdef __UNCONST