[CDMAKE]: Remove potential trailing dir-separator characters at the end of the direct...

[CDMAKE]: Remove potential trailing dir-separator characters at the end of the directory, in case e.g. we build up something like: "bootcd\\somefile.ext" in the boot/livecd.lst files (--> I want a directory "bootcd" and a file "somefile.ext", instead of the directory "bootcd\", otherwise the ISO becomes broken. Notice that when the path is "bootcd\somefile.ext the existing code worked ok. That's why I want to strip the remaining backslashes).

svn path=/trunk/; revision=66050