Further clarify build flag requirements

README

@@ -25,7 +25,9 @@ considering applying this Ungoogled patch series to a non-Debian Chromium tree,
 it may be a good idea to use the upstream Ungoogled patch series as a starting
 point instead of this patch series.
 
-If building a Debian package, the following options will need to be set in the
-debian/rules file:
+If building a Debian package, and the Ungoogled patches are applied, the
+following build flags will need to be set in the debian/rules file:
  * safe_browsing_mode=0
  * build_with_tflite_lib=false
+
+These flags are NOT required for the base ppc64el patchset alone.