This version will no longer enforce that wheels exist for linux-x86
when running in "verify" mode. This is a prerequisite to rolling out
new wheels to vpython specs that use verification, since we no longer
build for Linux 32-bit.

Bug: 1176014
Change-Id: I13e77fe7b9ccc3741fa05ae493d171d0ed9aecac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2878769
Commit-Queue: Brian Ryner <bryner@google.com>
Auto-Submit: Brian Ryner <bryner@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>