Keep build_detect_platform portable
Summary: AFAIK proper /bin/sh does not support "+=". Note that only our changes use "+=". The Google code does A="$A + $B" rather than A+=$B. Task ID: # Blame Rev: Test Plan: build Revert Plan: Database Impact: Memcache Impact: Other Notes: EImportant: - begin *PUBLIC* platform impact section - Bugzilla: # - end platform impact - Reviewers: dhruba Reviewed By: dhruba Differential Revision: https://reviews.facebook.net/D6231
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