[arch-general] updated PKGBUILD for openswan

[Ray Kohler]

The openswan package in core is rather old. I've updated the PKGBUILD
for the latest version, 2.6.23. This includes rather a lot of build
changes - some are cleanup that could have happened before, some are
new for upstream changes.

I built this to investigate whether I could use it instead of
strongSwan. I could not get it to work for my purposes, but rather
than let that work go to waste, I figured I'd submit the PKGBUILD
here.
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