Use ctime instead of chrono #210

Job	Run time
gnumake-clang-tidy-native (clang++, c++14)	1m 15s
gnumake-clang-tidy-native (clang++, c++20)	1m 27s
gcc-native-cpp_dec_float (g++, c++14)	34m 10s
gcc-native (g++, c++14)	20m 21s
gcc-12-clang-14-native (g++-12, c++14)	22m 4s
gcc-native-cpp_dec_float-asan (g++, c++14)	2m 13s
gcc-native-cpp_dec_float (g++, c++17)	33m 45s
gcc-native (g++, c++17)	15m 56s
gcc-native-cpp_dec_float-asan (g++, c++20)	2m 51s
gcc-native-cpp_dec_float (g++, c++20)	33m 38s
gcc-12-clang-14-native (g++-12, c++17)	17m 0s
gcc-native (g++, c++20)	18m 34s
gcc-12-clang-14-native (g++-12, c++20)	20m 31s
gcc-native (clang++, c++14)	19m 13s
gcc-native-cpp_dec_float-tsan (g++, c++14)	9m 20s
gcc-12-clang-14-native (clang++-14, c++14)	17m 0s
gcc-native (clang++, c++17)	21m 11s
gcc-native-cpp_dec_float-ubsan (g++, c++14)	2m 49s
gcc-native-cpp_dec_float-tsan (g++, c++20)	8m 7s
gcc-native (clang++, c++20)	16m 58s
gcc-12-clang-14-native (clang++-14, c++17)	17m 19s
gcc-native-cpp_dec_float-ubsan (g++, c++20)	2m 54s
gcc-12-clang-14-native (clang++-14, c++20)	15m 59s
msvc-release-x64	19m 6s
msvc-release-x64-vs2022	21m 34s
	6h 35m 15s

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