This causes issues when running tools/node/fetch_deps.py on systems without
gyp as pre-installed python module. And we do not even need to do this for
building for node (with GN).

R=machenbach@chromium.org

Bug: v8:6105
Change-Id: If0089dedf176bb509b9fd000e5fe829f8a32bac6
Reviewed-on: https://chromium-review.googlesource.com/852458Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50416}