Fix chdb.h decl

programs/local/chdb.h

@@ -5,6 +5,7 @@
 #    include <cstdint>
 extern "C" {
 #else
+#    include <stdbool.h>
 #    include <stddef.h>
 #    include <stdint.h>
 #endif
@@ -56,9 +57,9 @@ struct chdb_conn
     bool connected;
 };
 
-CHDB_EXPORT chdb_conn * connect_chdb(int argc, char ** argv);
-CHDB_EXPORT void close_conn(chdb_conn * conn);
-CHDB_EXPORT struct local_result_v2 * query_conn(chdb_conn * conn, const char * query, const char * format);
+CHDB_EXPORT struct chdb_conn * connect_chdb(int argc, char ** argv);
+CHDB_EXPORT void close_conn(struct chdb_conn * conn);
+CHDB_EXPORT struct local_result_v2 * query_conn(struct chdb_conn * conn, const char * query, const char * format);
 
 #ifdef __cplusplus
 }