Add additional variables to ninja variable whitelist

These variables control whether we accept cached-results / not and
whether we should update the cache with locally executed results or not.
I need accpet-cached whitelisted to purge the the RBE cache for the
invalid cache entry we have set for the failure we say yesterday.

Bug: b/148387048

Change-Id: I7344fc083f82e0b7bc11084376a267d19cf30bb8
diff --git a/ui/build/ninja.go b/ui/build/ninja.go
index 0b56b67..22ec1f1 100644
--- a/ui/build/ninja.go
+++ b/ui/build/ninja.go
@@ -133,6 +133,8 @@
 			"FLAG_invocation_id",
 			"FLAG_log_dir",
 			"FLAG_platform",
+			"FLAG_remote_accept_cache",
+			"FLAG_remote_update_cache",
 			"FLAG_server_address",
 
 			// ccache settings