This is to overcome a problem in building this part of the tree
from the new build structure. The current system relies on picking
up a Makefile.inc from a parent directory that sets WEBBASE and as
the subdirectories are entered this Makefile.inc is from a different
parent directory with a different WEBBASE setting.
This wasn't something I could workaround when building from the
new directory structure so as a short term cludge I now enter this
directory twice, once with NEW_BUILD defined so the subdirs are
skipped and once with DOCS set to null so only the directories are
built and WEBBASE is set appropriately in each case.