Always pass target_cpu to GN.

This will be necessary to make 32-bit iOS builds work.  See the -arm-
builders on https://skia-review.googlesource.com/c/7403/2.  Those bots
are actually default (i.e. arm64) builds, but will be fixed by this CL.

For some reason I cannot upload to Gerrit for this repo as
mtklein@chromium.org, though I can see all the commits in the repo.
Something seems amiss there.

Change-Id: I0d847913c23b9210326419294d5d3f86640fac99
Reviewed-on: https://skia-review.googlesource.com/7406
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
17 files changed
tree: b09c1bed62026e4bbdce52df9782dd9c41e5dec0
  1. .gitignore
  2. infra/
  3. recipe_modules/
  4. recipes.py
  5. recipes/
  6. test.py