Fixes build error where fuchsia_arm64 builds were failing because they
picked up linux x86 code.
Bug: None
Change-Id: I48a7bc92490604fd2a59cb4d36421cb76f579224
Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2172636
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
Commit-Queue: Ian Barkley-Yeung <iby@chromium.org>