Function xmlRegisterOutputCallbacks 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlRegisterOutputCallbacks(
    matchFunc: Option<unsafe extern "C" fn(filename: *const c_char) -> c_int>,
    openFunc: Option<unsafe extern "C" fn(filename: *const c_char) -> *mut c_void>,
    writeFunc: Option<xmlOutputWriteCallback>,
    closeFunc: Option<xmlOutputCloseCallback>,
) -> c_int

Register a new set of output I/O callbacks.

UPSTREAM-PARITY

int xmlRegisterOutputCallbacks(xmlOutputMatchCallback matchFunc,
                               xmlOutputOpenCallback openFunc,
                               xmlOutputWriteCallback writeFunc,
                               xmlOutputCloseCallback closeFunc);