Add condition for Windows, since it doesn't support the os.sysconf module.
We hardcode the commandline limit to 2K, as that should work on most
Windows platforms.
Signed-off-by: Marius Storm-Olsen <marius@trolltech.com> Acked-by: Simon Hausmann <simon@lst.de> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>