Add original PKGBUILD for svmlight
Update svmlight with improvements from user 'semi'

* From https://gist.github.com/sseemayer/5388328
* Removed evil sudo in build()
* Properly install license, fixed license (not MIT, but custom)
* Generate manpages from help output using help2man
* Fixed Upstream URL
* Fixed arch variable (should not be any for compiled code)