Booting from a logical partition failed with the "Requested logical
partition not found" error due to a wrong test for partition signature
in find_logical_partition().

Signed-off-by: Sergey Vlasov <vsu@altlinux.ru>

 Following changes to other Makefiles use $(CC) for examining compiler
options here as well.

Rewrite the algorithm to prefer entries which can be directly moved
into their target slots; this should reduce the number of descriptors
in most cases (although not necessarily *all* cases.)

Try to clean up the code some while we're at it... the code is
confusing enough as it is.

The old code could fail to coalesce backwards in the case where a
range is totally obliterated.  For now, just scan the whole list.

Print minimal message while loading.

Use the syslinux_memmap data structure for the free memory list.  This
means we get range coalescing; this sometimes generates lists that are
vastly shorter than without range coalescing.

Handle the case of an upward move when there is something in the way.
This happens when loading an SDI image.

COM32 module to load a Microsoft System Deployment Image (SDI) file.