[Legacy] Build failures in master

[dilijev]

https://github.com/Microsoft/ChakraCore/wiki/Build-Status#legacy-builds

http://dotnet-ci.cloudapp.net/job/Microsoft_ChakraCore/job/master/job/daily_dev12_x64_debug/109/consoleFull#85178576a82fefab-f698-416f-8fca-58544c94cd4e

10:58:08 
d:\j\workspace\daily_dev12_x---55cdd258\lib\common\Codex\Utf8Codex.cpp(486): error C2220: warning treated as error - no 'object' file generated [d:\j\workspace\daily_dev12_x---55cdd258\lib\common\Codex\Chakra.Common.Codex.vcxproj]
10:58:08           d:\j\workspace\daily_dev12_x---55cdd258\lib\common\Codex\Utf8Codex.cpp(513) : see reference to function template instantiation 'size_t utf8::EncodeIntoImpl<true>(LPUTF8,const char16 *,charcount_t)' being compiled
10:58:08 d:\j\workspace\daily_dev12_x---55cdd258\lib\common\Codex\Utf8Codex.cpp(486): warning C4127: conditional expression is constant [d:\j\workspace\daily_dev12_x---55cdd258\lib\common\Codex\Chakra.Common.Codex.vcxproj]

Edit: Failing in all flavors.

[dilijev]

Fixed in #1404
FYI @digitalinfinity @curtisman