[strongSwan] disable sending vendor id

[Marco Berizzi]

Hello everyone,

kindly, I would like to know if there is a way to 
make strongswan not send the 'vendor id'. 
Unfortunately the windows 10 update kb5009543 
introduced this regression:

"After installing this update, IP Security 
(IPSEC) connections that contain a Vendor ID might 
fail. VPN connections using Layer 2 Tunneling 
Protocol (L2TP) or IP security Internet Key 
Exchange (IPSEC IKE) might also be affected.


To mitigate the issue for some VPNs, you can 
disable Vendor ID within the server-side 
settings.

Note Not all VPN servers have the option to 
disable Vendor ID from being used.

We are presently investigating and will provide an 
update in an upcoming release."

Thanks in advance
Marco