Add jhasse's suggestion to suppress output on '--quiet'.

This just ensures that we also don't get the "Entering directory..." message
when the new '--quiet' flag is added.
diff --git a/src/ninja.cc b/src/ninja.cc
index 759ccd7..c7182df 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -1419,7 +1419,7 @@
     // subsequent commands.
     // Don't print this if a tool is being used, so that tool output
     // can be piped into a file without this string showing up.
-    if (!options.tool)
+    if (!options.tool && config.verbosity != BuildConfig::NO_STATUS_UPDATE)
       status->Info("Entering directory `%s'", options.working_dir);
     if (chdir(options.working_dir) < 0) {
       Fatal("chdir to '%s' - %s", options.working_dir, strerror(errno));