Remove luajit from the source tree

third_party/luajit/COPYRIGHT

third_party/luajit/Makefile

third_party/luajit/README

third_party/luajit/doc/bluequad-print.css

third_party/luajit/doc/bluequad.css

third_party/luajit/doc/changes.html

third_party/luajit/doc/contact.html

third_party/luajit/doc/ext_c_api.html

third_party/luajit/doc/ext_ffi.html

third_party/luajit/doc/ext_ffi_api.html

third_party/luajit/doc/ext_ffi_semantics.html

third_party/luajit/doc/ext_ffi_tutorial.html

third_party/luajit/doc/ext_jit.html

third_party/luajit/doc/extensions.html

third_party/luajit/doc/faq.html

third_party/luajit/doc/img/contact.png

third_party/luajit/doc/install.html

third_party/luajit/doc/luajit.html

third_party/luajit/doc/running.html

third_party/luajit/doc/status.html