Function svn_utf_cstring_to_utf8_ex 

pub unsafe extern "C" fn svn_utf_cstring_to_utf8_ex(
    dest: *mut *const c_char,
    src: *const c_char,
    frompage: *const c_char,
    convset_key: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Like svn_utf_cstring_to_utf8_ex2() but with @a convset_key which is ignored.

@deprecated Provided for backward compatibility with the 1.3 API.