Switch back to native C++ rules.

Other Google projects have ditched Starlark C++ rules for now.

Fixes #336.

Change-Id: Ida8ffa0f8724bd61a3642648db8279104036db3c
Reviewed-on: https://code-review.googlesource.com/c/re2/+/59310
Reviewed-by: Perry Lorier <perryl@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>
2 files changed