Set default toolchain file only for OneBranch/container builds #3855
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Description
.NET builds msquic using the same script (script/build.ps1) that we use to build the project, which does not work well with their cross-compile method where a toolchain file is not used as reported in dotnet/msquic#149.
This PR allows empty toolchain file for cross-compile. So, we only use a default toolchain file for our own OneBranch/container builds.
Testing
Needs help from @wfurt to test it.