Function xmlValidNormalizeAttributeValue 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlValidNormalizeAttributeValue(
    doc: *mut _xmlDoc,
    elem: *mut _xmlNode,
    name: *const xmlChar,
    value: *const xmlChar,
) -> *mut xmlChar

UPSTREAM-PARITY

xmlChar *xmlValidNormalizeAttributeValue(xmlDoc *doc, xmlNode *elem,
                                         const xmlChar *name,
                                         const xmlChar *value);