xmlrpc-c: Import from oldpackages, add myself as pkg maintainer, update license info.
- remove (marked BROKEN) abyss and libxml2 variants.
- build internal expat variant only.

Signed-off-by: Ted Hess <thess@kitschensync.net>
Merge pull request #375 from thess/xmlrpc-import

xmlrpc-c: Import from oldpackages, add myself as pkg maintainer, update ...