Merge "Skip unknown check in bootclasspath_fragment (source version) if...

Merge "Skip unknown check in bootclasspath_fragment (source version) if prebuilt version is in use." into main am: 378c7a39 am: 4e56c8b8 am: db032425

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2822393



Change-Id: Ibf4177f2cbad2c4022291d7e44ef7aa4bfd15ab2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>