Rework toolchain file and build libraries in MinSizeRel mode #75
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- No longer add `-gdwarf-2 -g3` unconditionally - Add `MinSizeRel` to the `CMAKE_CONFIGURATION_TYPES` - Explicitly specify the default flags for all 4 configuration types - Add `-ffunction-sections -fdata-sections`. Together with the already specified linker flag `--gc-sections` this helps reducing the binary size by allowing the linker to eliminate unused code.
I hope this fixes the failing CI workflow for building the Linux Docker image.
Ubuntu 23.04 had its end of life on January 25, 2024, so almost 11 months ago. Maybe that's why the CI job for building the Docker image fails.
Also raise the priority of all `update-alternative --install` calls to 99 to ensure that we will really use the our specified version.
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Fixes #73
Fixes #74