GN: Add PPC/s390 Linux support

Adding ppc/s390 architecture support to build config and
bootstrap.py to be able build GN binary.

BUG=
R=dpranke@chromium.org, brettw@chromium.org

Review-Url: https://codereview.chromium.org/2417443002
Cr-Original-Commit-Position: refs/heads/master@{#425502}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: fbf038170dc0bd29ead8630013b28c6008047ec1
2 files changed
tree: 1cd706744ededcc3b8841f5bc37c03d31f487962
  1. tools/