msvc: Allow building with Visual Studio Preview versions #586

Job	Run time
Windows MSVC 17 x64 - C++ Benchmark	2m 55s
Windows MSVC 17 x64 - C++ Benchmark	2m 55s
C++ Lint	6m 21s
C++ Lint	6m 21s
Windows MSVC 17 x64 - test run	29m 27s
Windows MSVC 17 x64 - test run	28m 32s
ubuntu-20.04 - C++ Benchmark	2m 34s
ubuntu-20.04 - C++ Benchmark	2m 34s
Windows MSVC 17 x86 - test run	30m 3s
Windows MSVC 17 x86 - test run	30m 3s
ubuntu-20.04 - test run	18m 30s
ubuntu-20.04 - test run	18m 30s
Windows MSVC 16 x64 - test run	12m 12s
Windows MSVC 16 x64 - test run	24m 0s
macos-12 - C++ Benchmark	2m 58s
macos-12 - C++ Benchmark	2m 58s
macos-12 - test run	22m 53s
macos-12 - test run	22m 53s
ubuntu-20.04 - with Clang compiler - test run	18m 31s
ubuntu-20.04 - with Clang compiler - test run	18m 31s
ubuntu-20.04 - without libclang completer - test run	18m 17s
ubuntu-20.04 - without libclang completer - test run	18m 17s
	5h 40m 15s

Provide feedback