Make the libcxx library available to com.android.virt am: d18279ed00 am: b73efe689d am: e4a46b058c am: 8cbe8f8f0f

Original change: https://android-review.googlesource.com/c/platform/external/rust/cxx/+/2045386

Change-Id: I06b90216d779413d81de25444d4b0bc1d6271d8c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>