Add missing header file to test/advancedcpp.h

[chococandy63]

Building tests shows the following errors. System info:

• Python 3.12.3
• gcc (Ubuntu 13.2.0-23ubuntu4) 13.2.0

Steps to reproduce

1. cd cppyy/test
2. Run make all

Expected

Builds successfully

Found

(venv) trinity@ukiyo:~/compres/cppyy/test$ make all
genreflex advancedcpp.h --selection=advancedcpp.xml --rootmap=advancedcppDict.rootmap --rootmap-lib=[[advancedcppDict.so](http://advancedcppdict.so/)](http://advancedcppdict.so/)
In file included from input_line_7:3:
./advancedcpp.h:330:5: error: unknown type name 'intptr_t'
intptr_t gime_address_ptr(void* obj) {
^
./advancedcpp.h:334:5: error: unknown type name 'intptr_t'
intptr_t gime_address_ptr_ptr(void** obj) {
^
./advancedcpp.h:338:5: error: unknown type name 'intptr_t'
intptr_t gime_address_ptr_ref(void*& obj) {
^
./advancedcpp.h:342:12: error: unknown type name 'intptr_t'
static intptr_t set_address_ptr_ptr(void** obj) {
^
./advancedcpp.h:347:12: error: unknown type name 'intptr_t'
static intptr_t set_address_ptr_ref(void*& obj) {
^
./advancedcpp.h:331:17: error: use of undeclared identifier 'intptr_t'
return (intptr_t)obj;
^
./advancedcpp.h:335:17: error: use of undeclared identifier 'intptr_t'
return (intptr_t)*((long**)obj);
^
./advancedcpp.h:339:17: error: use of undeclared identifier 'intptr_t'
return (intptr_t)obj;
^
./advancedcpp.h:343:12: error: use of undeclared identifier 'intptr_t'
(*(intptr_t**)obj) = (intptr_t*)0x4321;
^
./advancedcpp.h:343:22: error: expected expression
(*(intptr_t**)obj) = (intptr_t*)0x4321;
^
./advancedcpp.h:343:31: error: use of undeclared identifier 'intptr_t'
(*(intptr_t**)obj) = (intptr_t*)0x4321;
^
./advancedcpp.h:343:40: error: expected expression
(*(intptr_t**)obj) = (intptr_t*)0x4321;
^
Error: rootcling: compilation failure (./advancedcpp_rflxc933b38e1e_dictUmbrella.h)
make: *** [Makefile:31: advancedcpp_rflx.cpp] Error 1

Possible fix

Add cstdint header file on top of test/advancedcpp.h file.