Add old, still supported versions in CI matrix#692

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vgvassilev merged 2 commits intovgvassilev:masterfrom alexander-penev:AddSomeOldBuildVersionsInCI

Jan 1, 2024

+26-59

Commits on Dec 29, 2023

Add old, still supported versions in CI matrix
alexander-penev
committed

Commits on Jan 1, 2024

Change first supported version to 7.0. Clean pre-clang 7 compat fixes.

alexander-penev
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vgvassilev
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