[PATCH] Increase maximum length of http response buffer

[Adam Piątyszek]

Hi David,

It seems that my company upgraded the CSD trojan on their VPN gateways,
becasue I got the following error message from openconnect:

  Response body too large for buffer (141075 > 131072)

This patch fixes the problem for me, so please consider applying it
onto your master branch.

Thanks,
/Adam