Fix:

error: unknown type name 'uint64_t'
--- scripts/rpcgen/tests/demo.h.orig	2024-04-02 06:38:48.000000000 -0500
+++ scripts/rpcgen/tests/demo.h	2024-04-05 00:38:05.000000000 -0500
@@ -1,3 +1,5 @@
+#include <stdint.h>
+
 enum TestEnum {
     TEST_ENUM_ONE = 1,
     TEST_ENUM_TWO = 2,