Fix htdocs/ overwrite test in "make install" rule: it was still testing

for the presence of index.html, while it's been renamed to index.html.en
a couple of weeks ago.

Also, didn't we want to move /usr/local/apache/htdocs/manual/ out of
the user's htdocs/ tree to /usr/local/apache/manual/
and Alias /manual/ to /usr/local/apache/manual/ ?
And perhaps note the presence of the i18n versions of the entry page
in the CHANGES file?  [none of these are done in this commit]


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84209 13f79535-47bb-0310-9956-ffa450edef68