Fix source-build validation leg

[am11]

Trying to re-fix #114842 after --bootstrap change.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/runtime-infrastructure
See info in area-owners.md if you want to be subscribed.

[jkoritzinsky]

Can you confirm that we still used the bootstrapped ILC and bootstrapped libs? And the bootstrapped single file host if we were to be targeting a platform where NAOT isn't supported?

[am11]

Can you confirm that we still used the bootstrapped ILC and bootstrapped libs?

I think so based on --bootstrap builds followed by AOT smoke tests are passing for community platforms:

• freebsd-x64: https://github.com/am11/CrossRepoCITesting/actions/runs/14815857142
• freebsd-arm64: https://github.com/am11/CrossRepoCITesting/actions/runs/14815853974
• linux-riscv64: https://github.com/am11/CrossRepoCITesting/actions/runs/14815864500
• linux-musl-riscv64: https://github.com/am11/CrossRepoCITesting/actions/runs/14815898243

And the bootstrapped single file host if we were to be targeting a platform where NAOT isn't supported?

1. Community platforms are building _inbuilt using PublishSingleFile just like official platforms.
2. All desktop OS (other than illumos and haiku) are supporting AOT these days.

so I think we are covered.

[jkoritzinsky]

/ba-g failures unrelated and build analysis is stuck