Function xmlSprintfElementContent 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlSprintfElementContent(
    _buf: *mut c_char,
    _content: *mut _xmlElementContent,
    _englob: c_int,
)

UPSTREAM-PARITY

void xmlSprintfElementContent(char *buf, xmlElementContent *content,
                              int englob);

Deprecated; upstream (2.13+) ships this as an empty stub.