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Instead, copy the runtime to the build dir at build time and find it there
at test time.

Matches how things work on other platforms with the asan runtime in a shared
library (mac/ios/win).

This also makes things do the right thing with a custom clang_base_path.

Bug: 872278
Change-Id: I930bd88206f973c10eb47bfd2f132e70167235f4
Reviewed-on: https://chromium-review.googlesource.com/1167465Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581682}