Update git submodules

* Update external/boringssl from branch 'master'
  to 71257a0a0347296eba49f1ca39c0e6b024243ffb
  - Use genrule to pull in bindgen-erated source
    
    Rather than having a local modification of the upstream Rust source,
    instead use a genrule to replace the `${INCLUDES}` placeholder with
    a re-export of everything from the bindgen-created code.
    
    This change means that the upstream BoringSSL source no longer has a
    local modification, making it easier to import new versions.
    
    Also add a rust_test for the bindgen layout tests along the way.
    
    Bug: 177080016
    Test: build targets, atest libbssl_sys_raw_test
    Change-Id: Iabf1b6ac4ae7d3a391cc038b29f157347fb36f2f
    
1 file changed