Build

constexpr and decltype parsing #134

Job	Run time
ubuntu (ubuntu:20.04)	15m 28s
macOS (11, 3.6, 5.9.*, release)	12m 56s
windows (win64_mingw73, 3.10, 5.12.*, x64)	8m 1s
ubuntu (ubuntu:22.04)	13m 34s
oldschool (centos, 7, python-debug, debug)	7m 37s
macOS (11, 3.6, 5.9.*, debug)	6m 55s
windows (win64_msvc2017_64, 3.6, x64, 5.11.*)	9m 32s
oldschool (centos, 7, python-debug, release)	8m 43s
macOS (12, 3.11, 5.12.*, debug)	7m 2s
windows (win32_mingw53, 3.6, x86, 5.11.*)	8m 1s
oldschool (rockylinux, 9, python3-devel, release)	7m 52s
	1h 45m 41s

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