src/util/gensdsk is a shell script and should have execute permission.

Reported-by: sobtwmxt sobtwmxt@sdf.lonestar.org

The mtools version check does not handle GNU mtools 4.0.10.  This commit
makes the pattern more general so it matches older mtools as well as the
newer "mtools (GNU mtools) 4.0.10" string.

Signed-off-by: Stefan Hajnoczi <stefanha@gmail.com>
Signed-off-by: Marty Connor <mdc@etherboot.org>

The geniso, genliso and gensdsk scripts contain hard-coded temporary
directory names, and so could potentially collide with each other when
run as part of a concurrent build (e.g. "make -j 4").

Fix by using mktemp to generate suitable temporary directory names.

We add a syslinux floppy disk type using parts of the genliso script.
This floppy image cat be dd'ed to a physical floppy or used in
instances where a virtual floppy with an mountable DOS filesystem is
useful.

We also modify the genliso script to only generate .liso images
rather than creating images depending on how it is called.

Signed-off-by: Michael Brown <mcb30@etherboot.org>