Fixed issue wher eif dependencies caused a platform implementation to be processed twice it'd warn even if they were identical
(Needed for next Fortnite-specific CL).
[at]josh.adams
#rb na
#ROBOMERGE-OWNER: ben.marsh
#ROBOMERGE-AUTHOR: andrew.grant
#ROBOMERGE-SOURCE: CL 6763211 via CL 6763215 via CL 6763217 via CL 6763219 via CL 6763240 via CL 6763246
#ROBOMERGE-BOT: BUILD (Main -> Dev-Build) (v365-6733468)
[CL 6820724 by andrew grant in Dev-Build branch]
0985472eff