Update ninja proto, always enable `ninja -d stats`

The stats output will now use the new "DEBUG" message type, which we can
always redirect to verbose.log.gz.

Test: m aprotoc  (look in verbose.log.gz)
Change-Id: Ie1b58f12c008ff7d29f11ff7a9807488dba8a504
diff --git a/ui/build/soong.go b/ui/build/soong.go
index 2fbf381..6a12add 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -119,6 +119,7 @@
 		cmd := Command(ctx, config, "soong "+name,
 			config.PrebuiltBuildTool("ninja"),
 			"-d", "keepdepfile",
+			"-d", "stats",
 			"-o", "usesphonyoutputs=yes",
 			"-o", "preremoveoutputs=yes",
 			"-w", "dupbuild=err",