Update libloading dep to 0.7 am: 582dabe84f am: 5f291ee811 am: 2a1aea5bfe

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/clang-sys/+/1596562

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I0c7c6c3f497f6be22ce5c66604b0581c6947c881