Removed generated Autotools sources + patches generated from git

Apologies for the several changes here, but I couldn't think of an
easier way to manage it:

* Removed all Autotools-generated files
* Patches are generated using git, so the diff format has changed
slightly. This results in a lot of no-op changes.
* Renamed luaconf.h.template.in to luaconf.h.in
Build requires the Autotools
Updated spec to work with new patches