Remove libc++ from the musl sysroot am: 9f1ffdd3d9 am: e988d89106

Original change: https://android-review.googlesource.com/c/platform/external/musl/+/2676536

Change-Id: I8c6683d63acc119e6f72e7d4c46dbd0d31a384b7
Signed-off-by: Automerger Merge Worker <[email protected]>