[xml/sgml-pkgs] Bug#994795: w3-dtd-mathml: invalid redeclaration of predefined entities amp and lt yields failures with libxml2 2.9.12

[Vincent Lefevre]

Alternatively, I wonder whether w3c-sgml-lib (which appears to be
correct) could replace w3-dtd-mathml, in which case w3-dtd-mathml
should be removed from Debian, as what had been done with
w3c-dtd-xhtml.

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Vincent Lefèvre <vincent at vinc17.net> - Web: <https://www.vinc17.net/>
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