Create Core Update 74.

Will automatically increase the transparent proxy port
if it is set to 81.
core74: Add squid.

Covers the filedescriptors issues.
core74: Add openvpn.

This package has been updated before.
core74: Add updated proxy.cgi.

Reflects the FD changes.
core74: Add dnsforward.cgi to ISO.

Bug #10447.
core74: Add strongswan update.