Stop setting `CMAKE_CXX_STANDARD` #428

Job	Run time
clang-format	10s
Windows MSVC Shared Release	2m 24s
Windows MSVC Shared Debug	1m 34s
Windows MSVC Static Release	3m 13s
Windows MSVC Static Debug	3m 17s
Windows ClangCL Shared Release	3m 1s
Windows ClangCL Shared Debug	3m 18s
Windows ClangCL Static Release	4m 29s
Windows ClangCL Static Debug	4m 8s
Windows Clang Shared Release	2m 50s
Windows Clang Shared Debug	1m 39s
Windows Clang Static Release	2m 12s
Windows Clang Static Debug	3m 13s
Linux GCC Shared Release	48s
Linux GCC Shared Debug	58s
Linux GCC Static Release	1m 9s
Linux GCC Static Debug	1m 5s
Linux Clang Shared Release	1m 7s
Linux Clang Shared Debug	45s
Linux Clang Static Release	1m 28s
Linux Clang Static Debug	1m 25s
macOS Clang Shared Release	1m 4s
macOS Clang Shared Debug	56s
macOS Clang Static Release	1m 9s
macOS Clang Static Debug	47s
	48m 9s

Provide feedback