[patch] IS_ABSOLUTE_PATH to handle both DOS and POSIX path st yles

[Eli Zaretskii]

> From: Aleksandar Ristovski <ARistovski@qnx.com>
> Cc: dje@google.com, gdb-patches@sources.redhat.com,  	gcc-patches@gcc.gnu.org, Ryan Mansfield <RMansfield@qnx.com>
> Date: Wed, 9 Jan 2008 11:13:11 -0500
> 
> (This only works for drive letter in DOS paths, doesn't address the dir.
> Separator issue).

Right, and therefore why is it useful to consider partial solutions?
Can we at all use similar method to handle the slashes?