Remove code for older MySQL version (no longer supported)

Signed-off-by: Marc Delisle <marc@infomarc.info>
Translated using Weblate (Interlingua)

Currently translated at 57.5% (1594 of 2768)
Translated using Weblate (Tamil)

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Merge remote-tracking branch 'origin/QA_4_2' into QA_4_2
bug #4493 s_attention.png is missing

Signed-off-by: Marc Delisle <marc@infomarc.info>
Merge branch 'QA_4_2' of https://github.com/phpmyadmin/phpmyadmin into QA_4_2
Regenerate sprites

Signed-off-by: Marc Delisle <marc@infomarc.info>