Feature: AUX serial cleanup #2572

Job	Run time
build-linux (ubuntu-22.04, jammy, clang-18, 12.2.Rel1)	1m 18s
build-macos (macos-13, gcc@11)	1m 30s
build-linux (ubuntu-22.04, jammy, gcc-13, 12.2.Rel1)	1m 38s
build-macos (macos-latest)	19s
build-macos (macos-13, gcc@12)	1m 11s
build-macos (macos-12)	39s
build-macos (macos-13, gcc@13)	1m 11s
build-linux (jammy, 96b_carbon)	46s
build-mingw (windows-2022, mingw64)	2m 56s
build-macos (macos-13, gcc@14)	1m 44s
build-linux (jammy, bluepill)	36s
build-mingw (windows-2022, ucrt64)	2m 46s
build-msvc (meson, windows-2022)	1m 6s
build-linux (jammy, ctxlink)	44s
build-mingw (windows-2022, clang64)	2m 39s
size-diff	24s
build-linux (jammy, f072)	27s
build-linux (jammy, f3)	42s
build-linux (jammy, f4discovery)	32s
build-linux (jammy, hydrabus)	43s
build-linux (jammy, launchpad-icdi)	49s
build-linux (jammy, native)	31s
build-linux (jammy, stlink)	44s
build-linux (jammy, stlinkv3)	47s
build-linux (jammy, swlink)	38s
	27m 20s

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