Apply patches/ before creating source tarball, and remove

[fredemmott]

Not doing this immediately to minimize changes while fixing debian-8-jessie

[jjergus]

should we do this now?

[fredemmott]

this would still be good, but low-impact...

... on the other hand, if we're patching the source tarballs, it could be a good way to inject the HSL and somewhat higher impact :)

Problem there is testing changes to the HSL itself; HHVM has mechanisms for this (runtime-optional-extensions), but i think we'd need something like __PHPStdLib, but for the HSL, to make the HHIs work