prefix hash functions with uc_

fix prototype for hashuint

src/ucore_saxhash.c

@@ -1,7 +1,7 @@
 #include "ucore_hash.h"
 
 uint32_t
-sax_hash(void *key, size_t len)
+uc_sax_hash(void *key, size_t len)
 {
    unsigned char *p = key;
    unsigned h = 0;