Make libloading available to product and vendor am: 1270bf741a am: 92e958f168 am: e2ca7383f7 am: 0124c1adc3 am: 996948cd9b

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

Change-Id: I371f303313b2e4a903b74672bcb2a75561653bb2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>