[xml/sgml-pkgs] Bug#993638: xmlParseEntityDecl: entity xhtml-qname-extra.mod not terminated

[Torrance, Douglas]

Control: affects -1 src:macaulay2

I believe this bug is also affecting the build of the Macaulay2 package.  From
[1,2]:

/usr/bin/make -C M2 validate-html
make[2]: Entering directory '/<<BUILDDIR>>/macaulay2-1.18.0.1+git202109031258/M2'
-- validating all html and xhtml files in /<<BUILDDIR>>/macaulay2-1.18.0.1+git202109031258/M2/usr-dist/common/share/doc/Macaulay2
validating: BGG/html/_direct__Image__Complex.html
 *** invalid HTML: /<<BUILDDIR>>/macaulay2-1.18.0.1+git202109031258/M2/usr-dist/common/share/doc/Macaulay2/BGG/html/_direct__Image__Complex.html
error: line 338: xmlParseEntityDecl: entity xhtml-qname-extra.mod not terminated

...

validating: AlgebraicSplines/html/index.html
 *** invalid HTML: /<<BUILDDIR>>/macaulay2-1.18.0.1+git202109031258/M2/usr-dist/common/share/doc/Macaulay2/AlgebraicSplines/html/index.html
error: line 338: xmlParseEntityDecl: entity xhtml-qname-extra.mod not terminated

9328 HTML files checked; 9328 invalid
make[2]: *** [GNUmakefile:302: validate-html] Error 1

[1] https://launchpadlibrarian.net/556859860/buildlog_ubuntu-impish-amd64.macaulay2_1.18.0.1+git202109031258-0ppa202109031444~ubuntu21.10.1_BUILDING.txt.gz
[2] https://github.com/Macaulay2/M2/issues/2225
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