Remove handcrafted librustc_demangle_static am: 59b25ff22a am: eecfc6df8c am: e558a10948

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rustc-demangle-capi/+/2795153

Change-Id: Ib6e8a112f19072f6e997f726355789ea38a2acda
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>