Improves the CA validation

On IIS CA validation was not working as libcurl on windows does not look for a
certificate store, unless it is specified. The resource downloads are now
respecting the SecRemoteRulesFailAction.
iis: adds openssl to the build scripts

openssl is necessary to have curl talking in https
Version 2.9.0-RC1

Increasing version to 2.9.0-RC1.
This commit will be overwrite, missing the changelogs.