Fix missing export for RenameThread.

util.h

@@ -53,5 +53,6 @@ bool auth_stratum(struct pool *pool);
 bool initiate_stratum(struct pool *pool);
 void dev_error(struct cgpu_info *dev, enum dev_reason reason);
 void *realloc_strcat(char *ptr, char *s);
+void RenameThread(const char* name);
 
 #endif /* __UTIL_H__ */