Revert of [build] Temporarily switch off goma on gyp bot (patchset #1 id:1 of https://codereview.chromium.org/2802793002/ )

Reason for revert:
A different sysroot config fix was required here.

Original issue's description:
> [build] Temporarily switch off goma on gyp bot
>
> BUG=chromium:708482
> NOTRY=true
> TBR=tandrii@chromium.org
>
> Review-Url: https://codereview.chromium.org/2802793002
> Cr-Commit-Position: refs/heads/master@{#44418}
> Committed: https://chromium.googlesource.com/v8/v8/+/6cf74cb61b0f0e50a42b9fbe2b3d1f3c3dcfc14e

TBR=tandrii@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:708482

Review-Url: https://codereview.chromium.org/2799083002
Cr-Commit-Position: refs/heads/master@{#44420}