ylwrap: Change absolute path checks to check for DOS style path names.

ylwrap: Change absolute path checks to check for DOS style path names.

�
        * ylwrap: Change absolute path checks to check for DOS style path
        names.
        * ylwrap: Don't use a full path name if the source file is in the
        same directory.  From hjl@lucon.org (H.J. Lu).
Brought over from devo.

From-SVN: r22944