bake in runtime constant #1

Job	Run time
Build and test cmake:gcc9	50s
Build and test cmake:clang12	57s
Build and test cmake:clang12:asan	1m 7s
Build and test cmake:clang12:tsan	1m 30s
Build and test cmake:clang12:ubsan	1m 24s
Build and test cmake:qemu-arm-neon-gcc	2m 6s
Build and test cmake-osx:clang	46s
Build and test cmake-osx:gcc	53s
Build and test cmake-win64:msvc2019-rel	1m 9s
Build and test cmake-win64:msvc2019-dbg	1m 14s
Build and test fuzz:clang12	41s
Build and test python39:clang12	2m 15s
Build and test python39-win	1m 1s
Build and test maven	58s
Build and test bazel:root	46s
Build and test bazel:go	1m 7s
Build and test bazel:java	3m 13s
Build and test bazel:js	4m 36s
Build and test bazel:research	48s
Build and test bazel-osx:root	2m 55s
Build and test bazel-osx:go	3m 32s
Build and test bazel-osx:java	5m 41s
Build and test bazel-osx:js	8m 14s
Build and test bazel-osx:research	2m 42s
Build and test bazel-win:root	1m 20s
Build and test bazel-win:java	5m 59s
Build and test bazel-win:research	1m 47s
	59m 31s

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