Use a common routine to check for absoluteness of a path; this
	works for both Win32 and Unix and gets rid of #ifdefs.

PR:		2976, 3074
Submitted by:	Ken Parzygnat <kparz@raleigh.IBM.Com>
Reviewed by:	Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82284 13f79535-47bb-0310-9956-ffa450edef68