cpu: purge MMXEXT

Left-over post b4e63544

changed milestone to %4.0

added Component::Core Severity::trivial labels

changed the description

Left-over post b4e63544

Just FYI, I haven't forgotten to finish the cleanup, I have the WIP branch here - https://code.videolan.org/jnqnfe/vlc/-/commits/cpu/. I hadn't published any more of it yet because it's blocked waiting for something as I recall, I forget what exactly.

added MRStatus::Reviewable label

mentioned in merge request !1481 (merged)

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added 30 commits

• 0497914c...38d5ee47 - 27 commits from branch videolan:master
• 56e43fab - cpu: drop unused MMXEXT flag
• 77e29e39 - cpu: remove dead code
• 1754b12d - cpu: refactor #ifdef'ery

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enabled an automatic merge when the pipeline for 1754b12d succeeds

merged