Repaired partial_header include for generator csharp #267

Job	Run time
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AllOf)	1m 41s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/UseDateTimeForDate)	1m 13s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOfNoCompare)	2m 35s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/FormModels)	1m 34s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/OneOf)	1m 14s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/AnyOf)	1m 28s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOfNoCompare)	1m 22s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AllOf)	1m 15s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/AnyOf)	1m 16s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/OneOf)	1m 15s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/FormModels)	1m 23s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/UseDateTimeForDate)	1m 17s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.8/Petstore)	1m 35s
Build .Net projects (samples/client/petstore/csharp/generichost/net4.7/Petstore)	1m 23s
	20m 31s

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