Add Anyconnect Windows on ARM comapt support.

Description of problem:

(Summarize the bug encountered concisely) When connected from the Windows on ARM version of anyconnect(4.10.01075), get the following error : The AnyConnect package on the secure gateway could not be located. You may be experiencing network connectivity issues. Please try connecting again.

Version of ocserv used:

| 0.12.1-1 | | 1.1.2-2 | (Include the precise version of ocserv used)

Client used:

Windows on ARM version of anyconnect(4.10.01075) (Include the client used and its version; e.g., openconnect 8.1)

Distributor of ocserv

Debian10 (e.g., Ubuntu, Fedora, RHEL)

Expected results:

VPN connection established. (Describe the expected results)

Probably related Add support for Mac AnyConnect client | f928a11c | by Kevin Cernekee https://gitce.net/mirrors/ocserv/commit/f928a11cd0f27fdfdbe07667d2c295346d881a21