Fix dll naming for linux

[gleocadie]

We have a project that references TraceEvent Nuget package. When building that project, MSBuild generates the deps.json file for the executable and will copy/paste all TraceEvent dependencies in the output dir.
The deps.json will contain the original name of all assemblies needed to launch the executable.
The Microsoft.Diagnostics.Tracing.TraceEvent.props file instructs to copy OSExtensions.dll (original name) to the output directory and rename it to OsExtensions.dll.

When running the project on Linux, it won't start because it won't be able to find the OSExtensions.dll, because it has been renamed to OsExtensions.dll.

[vancem]

Thanks for fixing this. Checking this in.
There is likely to be something that forces an update to nuget.org in the week or two. If you need an official build of TraceEvent before that let me know and I will see what I can do to expedite it.

[gleocadie]

Hello @vancem , thanks for taking my PR.
About the NuGet, we can wait for the release of the next release. Thanks.