mariadb-10.5 @10.5.28 fails to build due to redefinition of libxml2 enumerators

[danaris (Timothy)]

This is essentially the same as #73622, but on mariadb-10.5 instead of 10.6.

Building fails with a long list of errors, starting with

error: redefinition of enumerator 'XML_ELEMENT_NODE'
:info:build    10 |      XML_ELEMENT_NODE       =  1,
:info:build       |      ^
:info:build /opt/local/include/libxml2/libxml/tree.h:168:5: note: previous definition is here
:info:build   168 |     XML_ELEMENT_NODE=           1,
:info:build       |     ^
:info:build In file included from /opt/local/var/macports/build/mariadb-10.5-10c504e0/work/mariadb-10.5.28/storage/connect/libdoc.cpp:35:
:info:build /opt/local/var/macports/build/mariadb-10.5-10c504e0/work/mariadb-10.5.28/storage/connect/plgxml.h:11:6: error: redefinition of enumerator 'XML_ATTRIBUTE_NODE'
:info:build    11 |      XML_ATTRIBUTE_NODE     =  2,
:info:build       |      ^
:info:build /opt/local/include/libxml2/libxml/tree.h:174:5: note: previous definition is here
:info:build   174 |     XML_ATTRIBUTE_NODE=         2,
:info:build       |     ^

This occurs even after a clean and full rebuild.

Hopefully the fix for 10.6 will also apply to 10.5.

[ryandesign (Ryan Carsten Schmidt)]

​https://jira.mariadb.org/browse/MDEV-36427 says it was fixed in 10.5.29.

Here is the PR updating mariadb-10.5 to 10.5.29: ​https://github.com/macports/macports-ports/pull/31625