Don't add std dependency when building rlib. am: ab2400dbd9 am: e6427cd03c am: 4eab12190c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bitflags/+/2036445

Change-Id: I627c224477ec9cff2d50a804683eae1ed59053be
Signed-off-by: Automerger Merge Worker <[email protected]>