[package] update strongswan4 to 4.5.2

[package]  update strongswan4 to 4.5.2

Update version of strongswan4 package from 4.5.1 to 4.5.2.

Add new strongswan4 plugins: coupling, duplicheck, whitelist.

Add strongswan4-libfast package and make build dependencies on
clearsilver and fcgi conditional. Previously libfast was being built,
but not packaged. Now libfast will only be built when the it's package
is selected.

Remove ipsec.conf and strongswan.conf and use configuration files from
upstream instead. The previously provided strongswan.conf was not
functional.

Omit strongswan4-mod-kernel-klips from strongswan4-full meta package in
favor of strongswan4-mod-kernel-netlink. Only one of these two kernel
interfaces should be installed.

Omit strongswan4-mod-socket-default from strongswan4-full meta package
in favor of strongswan4-mod-socket-raw. Only the raw socket allows
charon to run while pluto is also running.

Make all build dependencies on libraries required by strongswan4 plugins
conditional.

Signed-off-by: Lars Hjersted <lars@hjersted.com>
git-svn-id: svn://svn.openwrt.org/openwrt/packages@27092 3c298f89-4303-0410-b956-a3cf2f4a3e73