Make libloading available to product and vendor am: 1270bf741a am: 92e958f168 am: e2ca7383f7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/libloading/+/2476418

Change-Id: I6248a69e6daea236c926b81a3c1bb8f3627881d6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>