Not all platforms have INADDR_NONE defined by default. Apache used to

check for this and the define it if needed.  Since APR also needs this
check it makes more sense for APR to just check and export a symobl that
is always available.
Submitted by:	Branko �ibej <brane@xbc.nu>
Reviewed by:	Ryan Bloom


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86919 13f79535-47bb-0310-9956-ffa450edef68