Allow runner to run from anywhere.

This change adds flags to runner to allow it to be sufficiently
configured that it can run from any directory.

Change-Id: I82c08da4ffd26c5b11637480b0a79eaba0904d38
Reviewed-on: https://boringssl-review.googlesource.com/5130
Reviewed-by: Adam Langley <agl@google.com>
1 file changed