openvms: fix example name

[danielgustafsson]

Commit efc696a renamed persistant.c to persistent.c to fix the typo in the name, but missed to update the OpenVMS package files which still used the old name.

[vszakats]

Thank you @danielgustafsson! I excluded the vms subdir from my codespell update to avoid messing up anything VMS-related (can't test those), and missed this hidden connection — sorry about that.

FWIW here is all codespell finds for that directory, some of them valid, some not necessary:

./packages/vms/gnv_link_curl.com:86: includ  ==> include
./packages/vms/gnv_link_curl.com:743: persistant  ==> persistent
./packages/vms/curl_gnv_build_steps.txt:201: archictecture  ==> architecture
./packages/vms/setup_gnv_curl_build.com:61: includ  ==> include
./packages/vms/setup_gnv_curl_build.com:210: persistant  ==> persistent
./packages/vms/generate_config_vms_h_curl.com:226: disble  ==> disable
./packages/vms/generate_config_vms_h_curl.com:415: enviroment  ==> environment
./packages/vms/build_vms.com:45: includ  ==> include
./packages/vms/build_vms.com:282: includ  ==> include
./packages/vms/backup_gnv_curl_src.com:110: sav  ==> save
./packages/vms/backup_gnv_curl_src.com:126: sav  ==> save

[danielgustafsson]

Thank you @danielgustafsson! I excluded the vms subdir from my codespell update to avoid messing up anything VMS-related (can't test those), and missed this hidden connection — sorry about that.

Yeah, I fully understand that, I can't test it either but this seems to not make anything worse at least. I simply happened to run across it due to having a stale persistant binary that was no longer hidden by .gitignore after you fixed the spelling, and started digging from there.