Function Tcl_ZlibDeflate 

pub unsafe extern "C" fn Tcl_ZlibDeflate(
    interp: *mut Tcl_Interp,
    format: c_int,
    data: *mut Tcl_Obj,
    level: c_int,
    gzipHeaderDictObj: *mut Tcl_Obj,
) -> c_int