Add dsymutil to DEPS for Mac builds

This pulls down the current dsymutil package and places it in src/tools/clang

Bug: 930147
Change-Id: If75bd86e02f724de95bdc2f658ea2b1df1c0d76c
Reviewed-on: https://chromium-review.googlesource.com/c/1492298
Commit-Queue: Brad Hall <[email protected]>
Reviewed-by: Nico Weber <[email protected]>
Reviewed-by: Elly Fong-Jones <[email protected]>
Cr-Commit-Position: refs/heads/master@{#636163}
2 files changed