react-native run-windows command is failing at build step

[harinikmsft]

Per @marlenecota this has started occurring with msbuild version update to 16.3.0.46305. This is causing the CLI to not work anymore.

Workaround is to build the project in VS instead of msbuild, run yarn start and run the project from VS.

[licanhua]

The error is like this:
F:\repo\react-native-windows\node_modules.folly\folly-2019.08.12.00\folly\portability\Builtins.h(44,25): error C2373: '__builtin_clz': redefinition; different type modifiers (compiling source file CustomViewManager.cpp) [F:\repo\react-native-windows\packages\react-native-windows-extended\windows\react-native-windows-extended.vcxproj]

[marlenecota]

Fixed by #3279