restore dependencies for clang build
restore dependencies for clang build

Summary:
public
oops, last commit unintentionally removed the clang_plugin dependency of the
clang target.

Reviewed By: jberdine

Differential Revision: D2769897

fb-gh-sync-id: 95cda88

blzq/infer,xennygrimmato/infer,kageiit/infer,jsachs/infer,jsachs/infer,kstreee/infer,facebook/infer,jsachs/infer,facebook/infer,ryoon/infer,jsachs/infer,kstreee/infer,ropas/infer,kstreee/infer,ropas/infer,ropas/infer,jvillard/infer,facebook/infer,kstreee/infer,xennygrimmato/infer,blzq/infer,xennygrimmato/infer,facebook/infer,kstreee/infer,blzq/infer,xennygrimmato/infer,kageiit/infer,ropas/infer,kstreee/infer,jvillard/infer,jvillard/infer,ryoon/infer,ropas/infer,blzq/infer,jvillard/infer,jvillard/infer,xennygrimmato/infer,ryoon/infer,ryoon/infer,facebook/infer,kageiit/infer,ropas/infer,ryoon/infer,blzq/infer,blzq/infer,facebook/infer,kageiit/infer,facebook/infer,xennygrimmato/infer,ryoon/infer,xennygrimmato/infer,jvillard/infer,kageiit/infer,jvillard/infer,jsachs/infer,kageiit/infer,kageiit/infer,jsachs/infer