libdrm requirement for Plasma 5.26

[Norbert Preining]

> We would like to bump the required libdrm version in Plasma 5.26 to 2.4.112

I am providing backports for Debian/stable, where there is an older libdrm,
but I can ship a backported version of newer libdrm in my repos, similar
to other packages.

So should be fine.

Norbert

--
PREINING Norbert                              https://www.preining.info
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