Add LIBXML_RECOVER (#13504)

Setting the recovery option by using a hardcoded value (1) worked
already for SimpleXML. For DOM, a small change is necessary because
otherwise the recove

Add LIBXML_RECOVER (#13504)

Setting the recovery option by using a hardcoded value (1) worked
already for SimpleXML. For DOM, a small change is necessary because
otherwise the recover field overwrites the recovery option.

From a quick search on GitHub [1] it looks like this won't clash with
existing PHP code as no one seems to define (or use) a constant with
such a name.

[1] https://github.com/search?q=LIBXML_RECOVER+language%3APHP&type=code&l=PHP

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