Bug
1574761 - Avoid race condition creating old-configure. r=nalexander
This is not something that happens under normal circumstances, but it
can happen when you go fancy and run multiple configures in parallel
with different objdirs, and old-configure doesn't exist in the first
place ; then one configure may overwrite old-configure while another is
starting to execute it, resulting in the latter nor executing
old-configure completely.
Differential Revision: https://phabricator.services.mozilla.com/D42428
--HG--
extra : moz-landing-system : lando