tectonic_engine_xetex 0.4.4

The [XeTeX](http://xetex.sourceforge.net/) engine as a reusable crate.
Documentation 
language = "C"
cpp_compat = true
style = "type"
include_guard = "TECTONIC_ENGINE_XETEX_BINDGEN_H"

[export.rename]
"CoreBridgeState" = "ttbc_state_t"

[enum]
prefix_with_name = true