Bug#703522: linux-image-3.2.0-0.bpo.4-rt-686-pae: Upgrading to 3.2.39-2~bpo60+1 fails with error (file missing)

[Alain Rpnpif <rpnpif@free.fr>]

This workaround fixes this issue :
sudo mkdir -p /usr/share/syslinux/themes/debian/extlinux

Note that extlinux and syslinux packages are uptodate from bpo.

-- 
Alain Rpnpif