Stop passing the gold plugin path to llvm-ar.

llvm-ar takes a --plugin argument but it is ignored for compatibility,
so passing it has no effect.

Change-Id: I4fc51d226d66cf2a43462d3d4ccc12e6e5ebb226

cc/sanitize.go

@@ -466,7 +466,6 @@ func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
 			flags.CFlags = append(flags.CFlags, "-fvisibility=default")
 		}
 		flags.LdFlags = append(flags.LdFlags, cfiLdflags...)
-		flags.ArGoldPlugin = true
 		if Bool(sanitize.Properties.Sanitize.Diag.Cfi) {
 			diagSanitizers = append(diagSanitizers, "cfi")
 		}