Enterprise Linux 8: Fix build errors, and add CI jobs

This branch updates Makefiles to resolve some build errors encountered on CentOS8 (and other Enterprise Linux 8 OSs), and adds CI jobs. The Enterprise Linux 8 build job uses CentOS stream 8, but should be usable on Red Hat 8 and all Enterprise Linux 8 clones (e.g. rocky/alma), since they're all ABI compatible.

Note: There are no changes to the source code in this branch - only to makefiles & CI config.

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• 0fc7bb4f - v1.3.1 release: Increment version numbers

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• 2ee1981f - WIP

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• cba53b90 - WIP

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• a0f90351 - WIP

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mentioned in commit 06ba3658

merged

mentioned in merge request !19 (merged)