Add BUILD file for zerocopy kleaf build

Test:
touch external/rust/crates/unicode-ident/WORKSPACE && \
touch external/rust/crates/proc-macro2/WORKSPACE && \
touch external/rust/crates/quote/WORKSPACE && \
touch external/rust/crates/syn/WORKSPACE && \
touch external/rust/crates/byteorder/WORKSPACE && \
touch external/rust/crates/zerocopy-derive/WORKSPACE && \
touch external/rust/crates/zerocopy/WORKSPACE && \
b build @zerocopy \
  --override_repository=unicode-ident=external/rust/crates/unicode-ident/ \
  --override_repository=proc-macro2=external/rust/crates/proc-macro2/ \
  --override_repository=quote=external/rust/crates/quote/ \
  --override_repository=syn=external/rust/crates/syn/ \
  --override_repository=byteorder=external/rust/crates/byteorder/ \
  --override_repository=zerocopy-derive=external/rust/crates/zerocopy-derive/ \
  --override_repository=zerocopy=external/rust/crates/zerocopy/
Bug: 304282799

Change-Id: Ief63ac2bf7ad8af4dc7eeac57f5deba86bd6c4fe
1 file changed