Create a simple makefile and allow regressions to use it. #880

Job	Run time
ubu-24 \| g++-14 \| c++2b \| libstdc++ \| ubuntu-24.04	6m 36s
ubu-24 \| clang++-19 \| c++23 \| libc++-18-dev \| ubuntu-24.04	7m 57s
ubu-24 \| clang++-19 \| c++20 \| libstdc++ \| ubuntu-24.04	8m 29s
ubu-24 \| g++-13 \| c++2b \| libstdc++ \| ubuntu-24.04	6m 49s
ubu-22 \| clang++-15 \| c++20 \| libstdc++ \| ubuntu-22.04	5m 46s
mac-13 \| clang++ \| c++2b \| default \| macos-13	5m 2s
mac-14 \| clang++ \| c++2b \| default \| macos-14	2m 30s
ubu-22 \| clang++-15 \| c++20 \| libc++-15-dev \| ubuntu-22.04	5m 48s
win-22 \| cl.exe \| c++20 \| default \| windows-2022	35s
win-22 \| cl.exe \| c++latest \| default \| windows-2022	36s
mac-13 \| clang++-15 \| c++2b \| default \| macos-13	7m 59s
aggregate-results	5s
	58m 12s

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