Some platforms don't want us messing with environ, and these seem to be
equivalent.

Bug: angleproject:3506
Change-Id: I66804e8accc30421c1cd32c0eda750500e3ecb60
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1646887Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>