GitLab

- Use bundled binutils by adding to cflags -B
- Enables dwarf-fission based on bundling (maybe correct?)
- Makes differ normalize -B paths so they can be compared between gyp/gn.

R=brettw@chromium.org
BUG=335824

Review URL: https://codereview.chromium.org/568613002

Cr-Commit-Position: refs/heads/master@{#295185}