ap_os_canonical_filename was not treating 'x:/' correctly.  The
	'/' was being stripped, then we'd call GetFullPathName which
	would take 'x:' and change it to the current path on x:, not
	the root of x:.  Also, we'd end up adding another slash to
	x:/ and leave the routine with a 'x://'.

PR:		3001
Submitted by:	Ken Parzygnat <kparz@raleigh.ibm.com>
Reviewed by:	Ben Laurie, Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82188 13f79535-47bb-0310-9956-ffa450edef68