Change an aapt "warning" from "*** " to "**** " (from three to four stars).
"*** " (three stars and a space) is the 'magic make error string'; so this change makes it
easier to find the real issues/errors in build logs.  Besides, other aapt messages are "**** ".
diff --git a/tools/aapt/ResourceTable.cpp b/tools/aapt/ResourceTable.cpp
index 0b531c2..1f9d152 100644
--- a/tools/aapt/ResourceTable.cpp
+++ b/tools/aapt/ResourceTable.cpp
@@ -2369,7 +2369,7 @@
                         if (configSet.find(region) == configSet.end()) {
                             if (configSet.count(defaultLocale) == 0) {
                                 fprintf(stdout, "aapt: warning: "
-                                        "*** string '%s' has no default or required localization "
+                                        "**** string '%s' has no default or required localization "
                                         "for '%s' in %s\n",
                                         String8(nameIter->first).string(),
                                         config.string(),