Conditionally apply rustdoc flags to third party crates

This CL changes the logic in rust/builder.go so that some rustdoc flags
are only applied to external crates.  This will allow us to since
warnings and deal with soft-failures in external crates while allowing
us to be more strict with our internal Rust code.

Bug: 195136952
Test: m rustdoc
Change-Id: Icdde304bbbb323cae9657e8f842f58ae79e811ce