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fix some building warning

1

Dear maintainers, There are some building warnings and This PR is to removing these warnings Could U please review? Thanks

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modify NetdataYAML.cmake to fix compilation error

3

##### Summary There is an error while building netdata without module yaml-1.0, thils PR is to fix this issue. ##### Test Plan 1) ```cmake -DENABLE_PLUGIN_XENSTAT=False``` cmake information is as following...