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The parameters of a script invocation needs to be relative to the
directory where the script is invoked which is available as the
`root_build_dir` variable.

Using `root_out_dir` is incorrect as it has a different value for
secondary toolchains (i.e. current_toolchain != default_toolchain).

Bug: none
Change-Id: I573af8eb46c001fbedc641f5e47022f0424284c9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489622
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819348}