Log MSBuild process locale

[KirillOsenkov]

I often see binlogs in German, French, etc. but there's no way to easily get the language except for guessing.

If we want to properly parse localized binlogs we need to know the language. Since we already log the binlog path, process, arguments, etc. let's also log the current culture of MSBuild.exe.

[KirillOsenkov]

See related: #1596

[KirillOsenkov]

Same approach as in #2810

[KirillOsenkov]

https://source.dot.net/#q=GetMessagesToLogInBuildLoggers

[KirillOsenkov]

#5426

[rainersigwald]

Do we need more than #5426?

[KirillOsenkov]

Nope