Msvc with ‘/std:c++latest’: std::uncaught_exception() is deprecated in C++17

[PhoebeHui]

std::uncaught_exception() is deprecated in C++17, which is breaking builds by msvc with ‘/std:c++latest’ option on Windows.
Even I /D _SILENCE_CXX17_UNCAUGHT_EXCEPTION_DEPRECATION_WARNING to avoid the warning, but Chakra need address the issue since it affects all users.

https://github.com/Microsoft/ChakraCore/blob/master/bin/External/catch.hpp#L7915

D:\Chakra\src\bin\External\catch.hpp(7915): error C2220: warning treated as error - no 'object' file generated (compiling source file NativeTests.cpp)
D:\Chakra\src\bin\External\catch.hpp(7915): warning C4996: 'std::uncaught_exception': warning STL4006: std::uncaught_exception() is deprecated in C++17. It is superseded by std::uncaught_exceptions(), plural. You can define _SILENCE_CXX17_UNCAUGHT_EXCEPTION_DEPRECATION_WARNING or _SILENCE_ALL_CXX17_DEPRECATION_WARNINGS to acknowledge that you have received this warning. (compiling source file NativeTests.cpp)

[StephanTLavavej]

Please note that Phoebe is referring to a C++17 deprecation warning that I've implemented in an unreleased build of MSVC 2017 (the second toolset update; not 2017 15.3 which is the first toolset update).

[curtisman]

Catch is an external dependency we use for our native unit test. As such, we probably won't fix unless the external dependency make the change as well.

[StephanTLavavej]

The warning has been suppressed in upstream Catch: catchorg/Catch2#927