Freetdm - ISDN:Fix for race condition where we receive a new call, and did not finish clearing existing call internally.

FS-5200 --resolve this patch did not apply please be up to date with latest HEAD when generating patches

mod_http_cache: add support for http/https formats if enable-file-formats is set to true in http_cache.conf. Don't load mod_httapi if you use this option

This reverts commit 05895faa.

FS-4262 --resolve
FS-5189 --resolve

Thanks-to: <royj@yandex.ru>

Thanks-to: <royj@yandex.ru>

FS-5171 Please try this.  Get a similar trace and if you can, compare it to the trace without the SBC in place.

version.