Merge "Drop HOST_CROSS_OS special-case in source vs prebuilt mainline...

Merge "Drop HOST_CROSS_OS special-case in source vs prebuilt mainline selection" into main am: f52543b2

Original change: https://android-review.googlesource.com/c/platform/build/+/3032150



Change-Id: I2fbf6c43cc465036e72237c07380c416074d3350
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>