msvc: Allow building with Visual Studio Preview versions #569

Job	Run time
C++ Lint	5m 59s
C++ Lint	5m 59s
Windows MSVC 17 x64 - C++ Benchmark	4m 24s
Windows MSVC 17 x64 - C++ Benchmark	4m 24s
ubuntu-20.04 - C++ Benchmark	13m 44s
ubuntu-20.04 - C++ Benchmark	13m 44s
Windows MSVC 17 x64 - test run	12m 12s
Windows MSVC 17 x64 - test run	29m 5s
ubuntu-20.04 - test run	18m 46s
ubuntu-20.04 - test run	18m 46s
Windows MSVC 17 x86 - test run	31m 7s
Windows MSVC 17 x86 - test run	31m 7s
macos-12 - C++ Benchmark	3m 47s
macos-12 - C++ Benchmark	3m 47s
Windows MSVC 16 x64 - test run	29m 43s
Windows MSVC 16 x64 - test run	29m 43s
macos-12 - test run	21m 38s
macos-12 - test run	21m 38s
ubuntu-20.04 - with Clang compiler - test run	20m 9s
ubuntu-20.04 - with Clang compiler - test run	20m 9s
ubuntu-20.04 - without libclang completer - test run	18m 14s
ubuntu-20.04 - without libclang completer - test run	18m 14s
	6h 16m 19s

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