prefix hash functions with uc_

fix prototype for hashuint

src/ucore_hash.h

@@ -29,7 +29,7 @@ uint32_t
 uc_pjwhash(const char *str,size_t len);
 
 uint32_t
-sax_hash(void *key, size_t len);
+uc_sax_hash(void *key, size_t len);
 
 #ifdef __cplusplus
 }