bug#47257: [PATCH v3] gnu: mariadb: Fix CVE-2021-27928.

[Léo Le Bouter]

v3 tested and builds fine:

$ ./pre-inst-env guix build mariadb
/gnu/store/f70jymwyfcnsghy4jg8caibci59p8rgq-mariadb-10.5.8-dev
/gnu/store/cj3qym1x1jjh02m2g23cqpbhchrbmn6c-mariadb-10.5.8-lib
/gnu/store/mpb5bdf1vkwazqfmmwcvskdm50g191bg-mariadb-10.5.8

Since we don't have PoC, I can't verify the rebased patch actually
fixes the security issue but it should. That's what we get when
manually rebasing stuff to earlier versions. Test suite passes but not
sure it actually tests this security issue being fixed.

Please review, then I will push, it's been 7 days so, let's get this
in.

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