unity unittest

[unity]尝试去掉重复的PInvoke定义，看能否解决unity ci卡死 #902

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Run time

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Job	Run time
unittest-osx-dotnet	3m 40s
unittest-linux-dotnet	5m 12s
unittest-win-dotnet	8m 43s
unittest-win-unity	21m 14s
	38m 49s