carto/protobuf @ php-ignore-enum

Jan Tattermusch 36fa3c6d4d add missing C# windows presubmit.cfg file (#5894)		%!s(int64=6) %!d(string=hai) anos
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build.bat	67fee07308 C#: set some dotnet options when testing	%!s(int64=6) %!d(string=hai) anos
continuous.cfg	79c32b17ac add scripts for C# windows tests	%!s(int64=6) %!d(string=hai) anos
presubmit.cfg	36fa3c6d4d add missing C# windows presubmit.cfg file (#5894)	%!s(int64=6) %!d(string=hai) anos