Remove ap_private_extern method of hiding conflicting symbols

on the NEXT platform because it is not correct for all versions,
and the versions for which it is correct are unknown.

PR:
Obtained from:
Submitted by:	Wilfredo Sanchez <wsanchez@apple.com>
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82273 13f79535-47bb-0310-9956-ffa450edef68