Function xmlThrDefParserInputBufferCreateFilenameDefault 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlThrDefParserInputBufferCreateFilenameDefault(
    func: Option<unsafe extern "C" fn(*const c_char, c_int) -> *mut _xmlParserInputBuffer>,
) -> Option<unsafe extern "C" fn(*const c_char, c_int) -> *mut _xmlParserInputBuffer>

Upstream xmlThrDefParserInputBufferCreateFilenameDefault(...).